# eTools by Ganvya > eTools by Ganvya is an open source web application. Documents, images, developer utilities, and engineering calculators run in your browser. No account. Canonical: https://etools.ganvya.com Contact: ganvyatech@gmail.com eTools by Ganvya is published by Ganvya. Contact: ganvyatech@gmail.com. Files and text stay on the device. The file itself is not uploaded. Engineering and construction calculators are planning aids. They are not a structural design, a code check, or a quotation. ## Main pages - https://etools.ganvya.com/ : homepage and search - https://etools.ganvya.com/tools : every tool - https://etools.ganvya.com/pdf : Edit, merge, split, compress and convert PDFs. - https://etools.ganvya.com/image : Edit photos, remove a background, and resize, compress or convert images. - https://etools.ganvya.com/developer : Format JSON, convert cURL and CSV, decode tokens, hash text and build cron schedules. - https://etools.ganvya.com/generators : Create QR codes, passwords, test data, campaign links and calendar files. - https://etools.ganvya.com/calculators : Loans, savings goals, cash-flow returns, subnets, units and dates. - https://etools.ganvya.com/engineering : A studio for a whole bay, plus steel, rebar, concrete, masonry and site quantities. - https://etools.ganvya.com/guides : short guides - https://etools.ganvya.com/resources : index of settings, guides, and the legal pages - https://etools.ganvya.com/about : who publishes eTools - https://etools.ganvya.com/contact : ganvyatech@gmail.com - https://etools.ganvya.com/settings : what this browser stores, and how to clear it - https://etools.ganvya.com/privacy : files stay on the device; what a request can contain - https://etools.ganvya.com/cookies : values stored in the browser, and how to remove them - https://etools.ganvya.com/terms : conditions for using the site - https://etools.ganvya.com/licensing : licence for the hosted tools, and the names that stay with Ganvya - https://etools.ganvya.com/sitemap.xml : full URL list ## PDF & Document - [Edit PDF](https://etools.ganvya.com/pdf/edit-pdf): Add text, images, shapes and a signature. Place text, images, shapes, links and a signature on a PDF, then download it. - [Merge PDF](https://etools.ganvya.com/pdf/merge-pdf): Combine PDF files into one document. Join several PDFs into a single file, in the order you choose. Free forever. - [Split PDF](https://etools.ganvya.com/pdf/split-pdf): Extract pages or save every page separately. Pull a page range out of a PDF, or save every page as its own file. Free forever. - [Compress PDF](https://etools.ganvya.com/pdf/compress-pdf): Reduce PDF file sizes. Make a PDF smaller. Free forever. - [PDF to Word](https://etools.ganvya.com/pdf/pdf-to-word): Save PDF text as a Word document. Read the selectable text from a PDF and download a .docx file. Free forever. - [Word to PDF](https://etools.ganvya.com/pdf/word-to-pdf): Turn a .docx file into a PDF. Read the paragraphs in a .docx file and place them on A4 pages. Free forever. - [PDF to Excel](https://etools.ganvya.com/pdf/pdf-to-excel): Group PDF text into spreadsheet rows. Place words that share a line into cells and download an .xlsx file. Free forever. - [Excel to PDF](https://etools.ganvya.com/pdf/excel-to-pdf): Print the first sheet to a PDF table. Read the first worksheet of an .xlsx file and draw it as a simple landscape table. Free forever. - [PDF to PowerPoint](https://etools.ganvya.com/pdf/pdf-to-powerpoint): Put each PDF page on a slide. Draw each PDF page as a picture and place it on its own widescreen slide. Free forever. - [PowerPoint to PDF](https://etools.ganvya.com/pdf/powerpoint-to-pdf): Save slide text as a PDF. Read the text from each .pptx slide and place it in a PDF. Free forever. - [PDF to JPG](https://etools.ganvya.com/pdf/pdf-to-jpg): Export each page as a JPEG. Save every page as a JPEG. Free forever. - [JPG to PDF](https://etools.ganvya.com/pdf/jpg-to-pdf): Place JPEG photos on PDF pages. Turn one or more JPG images into a PDF, one picture per page. Free forever. - [PNG to PDF](https://etools.ganvya.com/pdf/png-to-pdf): Place PNG images on PDF pages. Turn one or more PNG images into a PDF. Free forever. - [WebP to PDF](https://etools.ganvya.com/pdf/webp-to-pdf): Place WebP images on PDF pages. Turn WebP images into PDF pages. Free forever. - [Image to PDF](https://etools.ganvya.com/pdf/image-to-pdf): Place JPG, PNG and WebP images on PDF pages. Turn one or more images into a PDF. Free forever. - [PDF to PNG](https://etools.ganvya.com/pdf/pdf-to-png): Export each page as a PNG. Draw every page and download the PNGs in a zip. Free forever. - [Rotate PDF](https://etools.ganvya.com/pdf/rotate-pdf): Turn PDF pages clockwise or around. Turn each page on the preview, or turn every page together. Free forever. - [Reorder PDF Pages](https://etools.ganvya.com/pdf/reorder-pdf): Move PDF pages into a new order. Drag the page previews into the order you want and save a new PDF. Free forever. - [Delete PDF Pages](https://etools.ganvya.com/pdf/delete-pdf-pages): Remove pages from a PDF. Click the pages you want gone and download a PDF of what remains. Free forever. - [Extract PDF Pages](https://etools.ganvya.com/pdf/extract-pdf-pages): Save a selection of pages as one PDF. Click the pages to keep, or type a list such as 2-4, 8, and save them as one PDF. Free forever. - [Add PDF Page Numbers](https://etools.ganvya.com/pdf/pdf-page-numbers): Stamp a number on each page. Draw a page number at the top or bottom of every page. Free forever. - [Add PDF Watermark](https://etools.ganvya.com/pdf/pdf-watermark): Draw text across each page. Place a short line of text diagonally on every page, in red and partly transparent. Free forever. - [Remove PDF Watermark](https://etools.ganvya.com/pdf/remove-pdf-watermark): Remove a watermark you are allowed to edit. Remove watermark and stamp annotations, and any literal text you type. Free forever. - [Password Protect PDF](https://etools.ganvya.com/pdf/protect-pdf): Encrypt a PDF with a password you choose. Save a copy that asks for a password to open. Free forever. - [Unlock PDF](https://etools.ganvya.com/pdf/unlock-pdf): Open a PDF with the password you were given. Enter the password that opens the file. Free forever. - [PDF Metadata Viewer](https://etools.ganvya.com/pdf/pdf-metadata): Read the title, author and dates. Show the document information stored in a PDF: title, author, subject, keywords, creator, producer and dates, plus the page count and file size. Free forever. - [PDF Metadata Editor](https://etools.ganvya.com/pdf/edit-pdf-metadata): Change the title, author and keywords. Edit the title, author, subject, keywords and creator, then save a new PDF. Free forever. - [PDF Page Size Converter](https://etools.ganvya.com/pdf/pdf-page-size): Fit pages onto A4, Letter, Legal, A3 or A5. Place each page onto a standard size, scaled to fit with a small margin. Free forever. - [PDF Cropper](https://etools.ganvya.com/pdf/crop-pdf): Cut a margin from every page. Set a margin in millimetres for each edge. Free forever. - [PDF Grayscale Converter](https://etools.ganvya.com/pdf/grayscale-pdf): Redraw a PDF in gray. Draw each page in grayscale and save a new PDF. Free forever. - [PDF OCR](https://etools.ganvya.com/pdf/pdf-ocr): Read text from a scanned PDF. Read English text from a scanned page so you can copy it. Free forever. - [Extract Text from PDF](https://etools.ganvya.com/pdf/extract-pdf-text): Show the selectable text. Read the text layer and show it on the page so you can copy it. Free forever. - [Extract Images from PDF](https://etools.ganvya.com/pdf/extract-pdf-images): Save the pictures embedded in a PDF. Pull out images that are stored as separate pictures and download them as PNGs in a zip. Free forever. - [Fill PDF Forms](https://etools.ganvya.com/pdf/fill-pdf-forms): Type into the fields of a PDF form. Fill text fields, tick boxes and choices on a PDF form, then download it with the fields still editable. Free forever. - [Flatten PDF Forms](https://etools.ganvya.com/pdf/flatten-pdf-forms): Burn form answers into the page. Write the current field values onto the page and remove the fields, so the answers can no longer be edited. Free forever. - [Compare Two PDFs](https://etools.ganvya.com/pdf/compare-pdfs): See which pages look different. Draw both PDFs and compare pages visually. Free forever. - [PDF to HTML](https://etools.ganvya.com/pdf/pdf-to-html): Save PDF text as a simple HTML file. Put the selectable text of each page into an HTML file. Free forever. - [HTML to PDF](https://etools.ganvya.com/pdf/html-to-pdf): Draw headings and paragraphs from HTML. Read headings, paragraphs, list items and preformatted text from HTML and draw them on A4 pages. Free forever. - [Markdown to PDF](https://etools.ganvya.com/pdf/markdown-to-pdf): Turn Markdown into an A4 PDF. Draw headings, paragraphs, lists and fenced code from Markdown onto A4 pages. Free forever. - [Text to PDF](https://etools.ganvya.com/pdf/text-to-pdf): Put plain text on A4 pages. Paste text and download an A4 PDF. Free forever. - [PDF to Text](https://etools.ganvya.com/pdf/pdf-to-text): Download the selectable text as .txt. Read the text layer and download a .txt file. Free forever. - [PDF Repair](https://etools.ganvya.com/pdf/repair-pdf): Rewrite a PDF that opens badly. Save a fresh copy of a damaged PDF. Free forever. - [PDF Bookmark Editor](https://etools.ganvya.com/pdf/pdf-bookmarks): Replace the outline with your own list. Read the current bookmarks, edit the titles and page numbers, and save a single-level outline. Free forever. - [PDF File Size Analyzer](https://etools.ganvya.com/pdf/pdf-size-analyzer): See page sizes, metadata and how much text is there. Report the file size, page count, page dimensions, document information and a character count of the text layer. Free forever. - [PDF Redaction Tool](https://etools.ganvya.com/pdf/redact-pdf): Cover text and remove it from the page. Draw boxes over the parts you need to hide. Free forever. - [PDF Signature Tool](https://etools.ganvya.com/pdf/sign-pdf): Draw or type a signature on a page. Place a drawn or typed signature on a page. Free forever. - [PDF to PDF/A Converter](https://etools.ganvya.com/pdf/pdf-to-pdfa): Flatten a PDF into an archival copy. Save a flattened copy of the PDF. Free forever. ## Image & Design - [Photo Editor](https://etools.ganvya.com/image/photo-editor): Edit, cut out and design photos. Crop, adjust, retouch and combine photos. Remove a plain background, cut out a shape, and add text, shapes and drawings. The file stays on your device. - [Background Remover](https://etools.ganvya.com/image/background-remover): Cut a subject out of a photo. Beta. Find the subject in a photo and clear the background, including a busy one. The cutout runs in your browser. Fine hair, glass and motion blur can still be rough. Free forever. - [Image Resizer](https://etools.ganvya.com/image/image-resizer): Resize images instantly. Resize JPG, PNG and WebP images. Free forever. - [Image Compressor](https://etools.ganvya.com/image/image-compressor): Reduce image file size before you send it. Shrink a JPG, PNG or WebP image by lowering the export quality and, if you want, the longest edge. You can see the size before and after. Free forever. - [Image Format Converter](https://etools.ganvya.com/image/image-converter): Convert between image formats. Convert between JPG, PNG, WebP, AVIF, GIF, BMP, TIFF and SVG. HEIC and the other formats above can be the source. JPEG fills transparency with white. Free forever. - [Color Palette Generator](https://etools.ganvya.com/image/color-palette): Build a palette or sample one from a photo. Generate harmonious colours from a base hex value, or extract the dominant colours from an image. Copy any swatch as you go. Free forever. ## Developer - [JSON Formatter & Validator](https://etools.ganvya.com/developer/json-formatter): Format and validate JSON. Pretty-print, minify and validate JSON. Free forever. - [Base64 Encoder / Decoder](https://etools.ganvya.com/developer/base64): Encode and decode text or files. Convert text or a file to Base64, and decode it back. Free forever. - [URL Encoder / Decoder](https://etools.ganvya.com/developer/url-encoder): Encode and decode URL components. Encode or decode text for a URL. Free forever. - [Regex Tester](https://etools.ganvya.com/developer/regex-tester): Test a JavaScript regular expression. Try a regular expression against sample text and preview a replacement. Free forever. - [JSON to TypeScript](https://etools.ganvya.com/developer/json-to-typescript): Turn a JSON sample into interfaces. Paste a JSON sample and get TypeScript interfaces. Nested objects become named types, and keys that differ across array items are optional. Free forever. - [CSV and JSON](https://etools.ganvya.com/developer/csv-json): Convert a table either way. Turn a CSV, semicolon or tab table into JSON, or turn a JSON array of objects back into CSV. Free forever. - [Hash Generator](https://etools.ganvya.com/developer/hash-generator): SHA-1 and SHA-2 hashes of text. Hash text as UTF-8 with SHA-1, SHA-256, SHA-384 and SHA-512. Each result is shown in hex and Base64. Free forever. - [JWT Decoder](https://etools.ganvya.com/developer/jwt-decoder): Read a JSON Web Token. Decode a JWT header and payload, and show when it was issued and when it expires. The signature is not checked. Free forever. - [cURL to Fetch](https://etools.ganvya.com/developer/curl-to-fetch): Turn a cURL command into fetch. Paste a cURL command, including wrapped lines and quotes, and get a JavaScript fetch call with the method, headers and body. Free forever. - [Cron Builder](https://etools.ganvya.com/developer/cron-builder): Write a cron expression in plain language. Build a five-field cron expression, read it in a sentence, and see the next five runs on this computer. Free forever. - [Unix Timestamp](https://etools.ganvya.com/developer/unix-timestamp): Convert seconds and milliseconds. Turn a Unix timestamp into your local time and UTC, or turn a local date into seconds and milliseconds. Free forever. ## Generators & Utilities - [QR Code Generator](https://etools.ganvya.com/generators/qr-code-generator): Create QR codes. Make a QR code from a URL or any text, then download it as PNG or SVG. Error correction and colours can be changed before you export. Free forever. - [Password Generator](https://etools.ganvya.com/generators/password-generator): Generate a password. Create a password from the characters you choose. Free forever. - [UUID Generator](https://etools.ganvya.com/generators/uuid-generator): Create version 4 UUIDs. Generate version 4 UUIDs, one at a time or as a list. Free forever. - [Random Number Generator](https://etools.ganvya.com/generators/random-number-generator): Draw integers or decimals in a range. Pick random integers or decimals between a minimum and a maximum. Free forever. - [Lorem Ipsum](https://etools.ganvya.com/generators/lorem-ipsum): Placeholder paragraphs, sentences or words. Generate placeholder Latin text by the paragraph, sentence or word, with the classic opening sentence when you want it. Free forever. - [Test Data Generator](https://etools.ganvya.com/generators/test-data): Fake rows for forms and APIs. Generate fake people as JSON or CSV. Emails use example.com and phone numbers use the reserved 555 range. The same seed repeats the same rows. Free forever. - [UTM Link Builder](https://etools.ganvya.com/generators/utm-builder): Add campaign tags to a link. Build a link with utm_source, utm_medium, utm_campaign, utm_content and utm_term. Existing query parameters stay in place. Free forever. - [Working Hours Finder](https://etools.ganvya.com/generators/timezone-planner): Find a time that is open in every city. Pick cities and a working day. The page finds the next stretches when every city is inside those hours, including daylight saving. Free forever. - [Calendar File](https://etools.ganvya.com/generators/ics-event): Make an .ics event. Create a calendar file from a title, date and time. Timed events are stored in UTC so they stay on the clock time you chose. Free forever. ## Calculators & Converters - [Unit Converter](https://etools.ganvya.com/calculators/unit-converter): Convert length, mass, area, volume, speed, pressure and temperature. Convert length, mass, area, volume, speed, pressure and temperature. Free forever. - [Percentage Calculator](https://etools.ganvya.com/calculators/percentage-calculator): Find a percentage, a change, or a share. Work out a percentage of a number, what percent one number is of another, and the change from one value to another. Free forever. - [Date Difference Calculator](https://etools.ganvya.com/calculators/date-difference): Count days, weekdays and months between two dates. Find the number of days, weeks, weekdays and calendar months between two dates, or add and subtract days from a date. Free forever. - [File Size Converter](https://etools.ganvya.com/calculators/file-size-converter): Convert bytes, kilobytes, megabytes and beyond. Convert file sizes between bytes, kilobytes, megabytes and the binary equivalents. Free forever. - [Loan Amortization](https://etools.ganvya.com/calculators/loan-calculator): Payment, interest and the full schedule. Work out a monthly payment, then see every month of principal, interest and balance. An extra payment shortens the term and shows the interest it saves. Free forever. - [Savings Goal](https://etools.ganvya.com/calculators/savings-calculator): Solve for value, contribution, time or rate. Find a future balance, the monthly amount a goal needs, how long it takes, or the rate required. Contributions compound monthly, with an optional inflation view. Free forever. - [Cash Flow Return](https://etools.ganvya.com/calculators/cash-flow): Present value and rate of return. Discount uneven amounts to a present value, and solve the annual rate that brings that value to zero. Free forever. - [Subnet Calculator](https://etools.ganvya.com/calculators/subnet-calculator): Split an IPv4 block into smaller networks. Find the network, broadcast, usable hosts and wildcard for an IPv4 prefix, then split that block into smaller networks. Free forever. ## Engineering & Construction - [Engineering Studio](https://etools.ganvya.com/engineering/engineering-studio): Drawings, quantities, a bar schedule and a beam diagram. Model slabs, beams, columns, footings and walls by level. Read the section, the bar plan, shear and moment, then the concrete, formwork, schedule and stock order. - [Steel Weight Calculator](https://etools.ganvya.com/engineering/steel-weight-calculator): Estimate the weight of bars, plate, pipe and angle. Calculate steel weight from section size, length and quantity. Free forever. - [Rebar Quantity Estimator](https://etools.ganvya.com/engineering/rebar-estimator): Estimate bar count and weight for a simple member. Estimate reinforcement for a slab, a beam or a column. Free forever. - [Concrete Volume Calculator](https://etools.ganvya.com/engineering/concrete-calculator): Find volume and a simple material estimate. Calculate concrete volume for a slab, wall, beam, column or cylinder, then estimate cement, sand and aggregate from a mix ratio. Free forever. - [Area & Volume Calculator](https://etools.ganvya.com/engineering/area-volume-calculator): Areas and volumes of common shapes. Calculate the area or volume of common shapes. Free forever. - [Rebar Weight Calculator](https://etools.ganvya.com/engineering/rebar-weight-calculator): Weight of round reinforcement bar. Calculate rebar weight from diameter, length and the number of bars. Free forever. - [Rebar Cutting Length Calculator](https://etools.ganvya.com/engineering/rebar-cutting-length): Cut length from legs and bend deductions. Add the out-to-out legs of a bar and subtract a deduction for each bend. Free forever. - [Rebar Bend Allowance Calculator](https://etools.ganvya.com/engineering/rebar-bend-allowance): Centreline length of one bend. Calculate the centreline arc of one rebar bend from the angle, the inner radius and the bar diameter. Free forever. - [Rebar Lap Length Calculator](https://etools.ganvya.com/engineering/rebar-lap-length): Lap as a multiple of bar diameter. Multiply a bar diameter by the lap multiple you choose. Free forever. - [Rebar Development Length Calculator](https://etools.ganvya.com/engineering/rebar-development-length): Development length as a multiple of diameter. Multiply a bar diameter by the development multiple you enter. Free forever. - [Rebar Spacing Calculator](https://etools.ganvya.com/engineering/rebar-spacing-calculator): How many bars fit across a span. Count bars from the clear distance inside the cover and a centre-to-centre spacing. Free forever. - [Rebar Bundle Weight Calculator](https://etools.ganvya.com/engineering/rebar-bundle-weight): Weight of bundled bars. Weigh a bundle of equal bars, then multiply by the number of bundles. Free forever. - [Bar Bending Schedule Generator](https://etools.ganvya.com/engineering/bar-bending-schedule): Total a schedule from the lengths you enter. Add bar marks with a diameter, a cutting length and a quantity. Free forever. - [Concrete Material Estimator](https://etools.ganvya.com/engineering/concrete-material-estimator): Cement, sand and aggregate from a mix. Turn a wet concrete volume into cement bags, sand and aggregate. Free forever. - [Cement Bag Calculator](https://etools.ganvya.com/engineering/cement-bag-calculator): 50 kg bags for a concrete volume. Estimate 50 kg cement bags from a wet concrete volume and a mix ratio. Free forever. - [Sand Quantity Calculator](https://etools.ganvya.com/engineering/sand-quantity-calculator): Sand volume for a concrete mix. Estimate the sand in a wet concrete volume from the sand share of the mix. Free forever. - [Aggregate Quantity Calculator](https://etools.ganvya.com/engineering/aggregate-quantity-calculator): Coarse aggregate for a concrete mix. Estimate coarse aggregate from a wet concrete volume and a mix ratio, using a dry volume factor of 1.54. Free forever. - [Brick Quantity Calculator](https://etools.ganvya.com/engineering/brick-quantity-calculator): Bricks for a wall face. Count bricks from the wall size, the brick face, the mortar joint and the number of leaves. Free forever. - [Block Quantity Calculator](https://etools.ganvya.com/engineering/block-quantity-calculator): Blocks for a wall face. Count concrete blocks from the wall size, the block face and the joint. Free forever. - [Mortar Quantity Calculator](https://etools.ganvya.com/engineering/mortar-quantity-calculator): Mortar left after the bricks. Estimate mortar as the masonry volume minus the solid volume of the bricks. A cavity is left out. Free forever. - [Plaster Quantity Calculator](https://etools.ganvya.com/engineering/plaster-quantity-calculator): Plaster volume, cement and sand. Estimate plaster from area, thickness and coats, then split cement and sand with the ratio you enter and a mortar dry factor of 1.33. Free forever. - [Paint Quantity Calculator](https://etools.ganvya.com/engineering/paint-quantity-calculator): Litres from coverage and coats. Estimate paint from the area, the coverage on the tin, the number of coats and a wastage percentage. Free forever. - [Tile Quantity Calculator](https://etools.ganvya.com/engineering/tile-quantity-calculator): Tiles for a rectangular floor. Count tiles from the room size, the tile size, the joint and a wastage allowance. Free forever. - [Flooring Quantity Calculator](https://etools.ganvya.com/engineering/flooring-quantity-calculator): Boards or sheets for a room. Count flooring pieces from the room area, the piece size, an optional joint and wastage. Free forever. - [Roof Area Calculator](https://etools.ganvya.com/engineering/roof-area-calculator): Sloped area from the plan and the pitch. Turn a horizontal roof plan into sloped area using rise and run. Free forever. - [Roof Pitch Calculator](https://etools.ganvya.com/engineering/roof-pitch-calculator): Degrees, percent and x in 12. Convert rise and run into roof pitch in degrees, percent, a rise in 12 and a 1-in-n gradient. Free forever. - [Staircase Calculator](https://etools.ganvya.com/engineering/staircase-calculator): Risers, goings and 2R + G. Split a floor-to-floor rise into equal risers near the riser you prefer, then apply one going. Free forever. - [Ramp Slope Calculator](https://etools.ganvya.com/engineering/ramp-slope-calculator): Percent, degrees and 1 in n. Calculate a ramp slope from the rise and the horizontal run. Free forever. - [Excavation Volume Calculator](https://etools.ganvya.com/engineering/excavation-volume-calculator): Bank volume and loose spoil. Calculate the bank volume of a rectangular excavation and the loose volume after a swell factor you enter. Free forever. - [Earthwork Quantity Calculator](https://etools.ganvya.com/engineering/earthwork-quantity-calculator): Cut, haul, yield and fill. Compare a bank cut with a compacted fill. Free forever. - [Foundation Concrete Calculator](https://etools.ganvya.com/engineering/foundation-concrete-calculator): Volume of strips or pads. Calculate foundation concrete from length, width, thickness and the number of foundations. Free forever. - [Footing Quantity Calculator](https://etools.ganvya.com/engineering/footing-quantity-calculator): Concrete in a set of footings. Calculate the concrete in repeated rectangular footings from length, width, thickness and the number of footings. Free forever. - [Column Volume Calculator](https://etools.ganvya.com/engineering/column-volume-calculator): Concrete in rectangular columns. Calculate column concrete from width, depth, height and the number of columns. Free forever. - [Beam Volume Calculator](https://etools.ganvya.com/engineering/beam-volume-calculator): Concrete in rectangular beams. Calculate beam concrete from width, depth, length and the number of beams. Free forever. - [Slab Volume Calculator](https://etools.ganvya.com/engineering/slab-volume-calculator): Concrete in a rectangular slab. Calculate slab concrete from length, width, thickness and the number of slabs. Free forever. - [Retaining Wall Quantity Calculator](https://etools.ganvya.com/engineering/retaining-wall-calculator): Stem and base concrete. Add the concrete in a retaining-wall stem and its base. Free forever. - [Formwork Area Calculator](https://etools.ganvya.com/engineering/formwork-area-calculator): Contact area of common members. Estimate formwork for a slab soffit, a beam, a column or a wall. Free forever. - [Structural Steel Weight Calculator](https://etools.ganvya.com/engineering/structural-steel-weight): Member weight from a section table. Total structural steel from the kilograms-per-metre figure in a section table, the length and the quantity of each member. Free forever. - [Angle Bar Weight Calculator](https://etools.ganvya.com/engineering/angle-bar-weight): Equal angle weight per metre. Calculate the weight of an equal angle from the leg, the thickness, the length and the quantity. Free forever. - [Flat Bar Weight Calculator](https://etools.ganvya.com/engineering/flat-bar-weight): Flat bar weight from width and thickness. Calculate flat bar weight from width, thickness, length and quantity at 7850 kg/m³. Free forever. - [Round Bar Weight Calculator](https://etools.ganvya.com/engineering/round-bar-weight): Round bar and rod weight. Calculate round bar weight from diameter, length and quantity. Free forever. - [Square Bar Weight Calculator](https://etools.ganvya.com/engineering/square-bar-weight): Square bar weight from the side. Calculate square bar weight from the side, the length and the quantity at 7850 kg/m³. Free forever. - [RHS Weight Calculator](https://etools.ganvya.com/engineering/rhs-weight-calculator): Rectangular hollow section weight. Calculate RHS weight from the outer width, outer height and wall thickness. Free forever. - [SHS Weight Calculator](https://etools.ganvya.com/engineering/shs-weight-calculator): Square hollow section weight. Calculate SHS weight from the outer side and the wall thickness. Free forever. - [Pipe Weight Calculator](https://etools.ganvya.com/engineering/pipe-weight-calculator): Circular hollow section weight. Calculate pipe weight from the outside diameter and the wall thickness. Free forever. - [Plate Weight Calculator](https://etools.ganvya.com/engineering/plate-weight-calculator): Sheet weight from width, length and thickness. Calculate steel plate weight from the sheet width, length, thickness and the number of sheets. Free forever. - [Steel Density Calculator](https://etools.ganvya.com/engineering/steel-density-calculator): Density from mass and volume. Divide a measured mass by a volume, either from the piece size or from a volume you already know. Free forever. - [Thermal Expansion Calculator](https://etools.ganvya.com/engineering/thermal-expansion-calculator): Change in length from temperature. Estimate how much a length changes when the temperature changes. Free forever. - [Beam Deflection Calculator](https://etools.ganvya.com/engineering/beam-deflection-calculator): Elastic deflection of a simple beam. Estimate midspan deflection of a simply supported beam. Free forever. - [Simply Supported Beam Calculator](https://etools.ganvya.com/engineering/simply-supported-beam): Reactions, moment and deflection. Find the support reactions and midspan moment of a simply supported beam, plus the elastic deflection. 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Free forever. ## Guides - [How to resize an image without uploading it](https://etools.ganvya.com/guides/how-to-resize-an-image): Change the pixel size of a JPG, PNG or WebP image in the browser, and know what that does to quality. - [How background removal works on this site](https://etools.ganvya.com/guides/how-to-remove-a-background): What the beta cutout does, why the first run downloads a model, and which edges it still misses. - [How PDF compression works in the browser](https://etools.ganvya.com/guides/how-to-compress-a-pdf): Why some PDF compressors keep selectable text and others shrink the file by redrawing the pages. - [How to edit a PDF without uploading it](https://etools.ganvya.com/guides/how-to-edit-a-pdf-locally): Add text, images and a signature in the browser, and know what is kept on this device. - [How to merge PDF files in the page](https://etools.ganvya.com/guides/how-to-merge-pdf-files): Combine files in the order you choose, leave pages out, and know what does not survive the copy. - [How steel weight is calculated](https://etools.ganvya.com/guides/how-steel-weight-is-calculated): The 7850 kg/m³ density behind reinforcement weight tables, with a worked round-bar example. - [How to estimate rebar for a simple member](https://etools.ganvya.com/guides/how-to-estimate-rebar): Bar counts from spacing and cover, the gap before the far cover, and what this estimate leaves out. - [How a concrete quantity is estimated](https://etools.ganvya.com/guides/how-concrete-quantity-is-estimated): Wet volume, the 1.54 dry factor for concrete, and why mortar and plaster use 1.33. - [How a simple beam deflection is checked](https://etools.ganvya.com/guides/how-a-beam-deflection-is-checked): The elastic formulas for a simply supported beam, and the check they are not. - [How to make a QR code that scans](https://etools.ganvya.com/guides/how-to-make-a-qr-code): What to put in a QR code, how error correction changes capacity, and how to export it. - [How a password is generated here](https://etools.ganvya.com/guides/how-passwords-are-generated): Where the characters come from, why the page does not store them, and where to keep the result. - [What “processed in your browser” means](https://etools.ganvya.com/guides/privacy-of-browser-tools): Which requests leave the device, what stays in the tab, and what the page can still see.