https://yantrastack.com/articles/ Free online PDF, image and developer tools that run entirely in your browser. No uploads, no accounts, no watermarks, no limits. en https://yantrastack.com/articles/base64-encode-decode-explained/ https://yantrastack.com/articles/base64-encode-decode-explained/ Thu, 22 Oct 2026 00:00:00 GMT Learn what Base64 is for, why it is not encryption, and how to encode or decode text with Unicode and URL-safe options. https://yantrastack.com/articles/format-and-validate-json-online/ https://yantrastack.com/articles/format-and-validate-json-online/ Wed, 21 Oct 2026 00:00:00 GMT Pretty-print messy JSON, find syntax errors by line and column, sort keys, minify, and escape or unescape strings, all locally. https://yantrastack.com/articles/resize-image-online-pixels-percentage/ https://yantrastack.com/articles/resize-image-online-pixels-percentage/ Tue, 20 Oct 2026 00:00:00 GMT Change image dimensions by width and height or by scale, keep proportions, pick the output format and quality, for many images at once. https://yantrastack.com/articles/convert-jpg-png-webp-online/ https://yantrastack.com/articles/convert-jpg-png-webp-online/ Mon, 19 Oct 2026 00:00:00 GMT Switch image formats in bulk, control quality, and choose the colour that fills transparent areas when converting to JPG. https://yantrastack.com/articles/how-local-first-browser-tools-work/ https://yantrastack.com/articles/how-local-first-browser-tools-work/ Sun, 18 Oct 2026 00:00:00 GMT A developer’s look at how tools like YantraStack process PDFs and images entirely client-side, using standard browser APIs, Web Workers and canvas. https://yantrastack.com/articles/how-to-compress-a-pdf-without-ruining-it/ https://yantrastack.com/articles/how-to-compress-a-pdf-without-ruining-it/ Sun, 18 Oct 2026 00:00:00 GMT Why some PDFs shrink a lot and others barely change, the difference between lossless and image-based compression, and how to pick the right setting. https://yantrastack.com/articles/jpg-vs-png-vs-webp/ https://yantrastack.com/articles/jpg-vs-png-vs-webp/ Sun, 18 Oct 2026 00:00:00 GMT A practical comparison of JPG, PNG and WebP covering photos, screenshots, logos and transparency, plus quality settings that work in practice. https://yantrastack.com/articles/pdf-page-ranges-cheat-sheet/ https://yantrastack.com/articles/pdf-page-ranges-cheat-sheet/ Sun, 18 Oct 2026 00:00:00 GMT How to type page selections like 1,3-5, 8- and last for splitting, extracting, rotating and removing PDF pages, with worked examples. https://yantrastack.com/articles/verify-a-tool-never-uploads-your-files/ https://yantrastack.com/articles/verify-a-tool-never-uploads-your-files/ Sun, 18 Oct 2026 00:00:00 GMT A one-minute test using your browser’s Network tab shows whether a PDF or image tool really keeps your files on your device, and what to look for. https://yantrastack.com/articles/jwt-explained-and-common-mistakes/ https://yantrastack.com/articles/jwt-explained-and-common-mistakes/ Sun, 18 Oct 2026 00:00:00 GMT What the three parts of a JSON Web Token contain, why decoding is not verifying, and the security mistakes developers make most often with JWTs. https://yantrastack.com/articles/reduce-image-size-to-100kb-200kb/ https://yantrastack.com/articles/reduce-image-size-to-100kb-200kb/ Sun, 18 Oct 2026 00:00:00 GMT Many portals cap photo size. Use the target size option to shrink a JPG or WebP below a limit like 100 KB or 200 KB, locally. https://yantrastack.com/articles/compress-image-online-no-upload/ https://yantrastack.com/articles/compress-image-online-no-upload/ Sat, 17 Oct 2026 00:00:00 GMT Shrink photos in bulk with a quality slider, optional size limit and format choice, all inside your browser so your pictures stay private. https://yantrastack.com/articles/convert-images-to-pdf/ https://yantrastack.com/articles/convert-images-to-pdf/ Fri, 16 Oct 2026 00:00:00 GMT Combine photos or scans into one PDF, set the order, page size, orientation and margin, and download it without uploading anything. https://yantrastack.com/articles/edit-pdf-metadata-title-author/ https://yantrastack.com/articles/edit-pdf-metadata-title-author/ Thu, 15 Oct 2026 00:00:00 GMT See and change a PDF's title, author, subject, keywords and creator, or clear all metadata before you share the file. https://yantrastack.com/articles/extract-text-from-pdf/ https://yantrastack.com/articles/extract-text-from-pdf/ Wed, 14 Oct 2026 00:00:00 GMT Copy all the text from a PDF into a plain text file, with optional page-break markers and password support. https://yantrastack.com/articles/unlock-pdf-you-own/ https://yantrastack.com/articles/unlock-pdf-you-own/ Tue, 13 Oct 2026 00:00:00 GMT If you know the password or own the file, remove the open password or copy and print limits by rebuilding the PDF as page images. https://yantrastack.com/articles/pdf-thumbnail-generator-guide/ https://yantrastack.com/articles/pdf-thumbnail-generator-guide/ Mon, 12 Oct 2026 00:00:00 GMT Create preview images from the first page, all pages or chosen pages of a PDF, at the width you need, as JPG, WebP or PNG. https://yantrastack.com/articles/choose-dpi-for-pdf-to-image/ https://yantrastack.com/articles/choose-dpi-for-pdf-to-image/ Sun, 11 Oct 2026 00:00:00 GMT 72, 150, 200 or 300 dpi? A plain-language guide to choosing resolution and format when exporting PDF pages as images for screen, web or print. https://yantrastack.com/articles/pdf-to-jpg-converter-online/ https://yantrastack.com/articles/pdf-to-jpg-converter-online/ Sat, 10 Oct 2026 00:00:00 GMT Turn each PDF page into an image at 72 to 300 dpi, choose the format and quality, and download images or a ZIP. Nothing is uploaded. https://yantrastack.com/articles/resize-pdf-to-a4-or-letter/ https://yantrastack.com/articles/resize-pdf-to-a4-or-letter/ Fri, 09 Oct 2026 00:00:00 GMT Convert every page of a PDF to a standard or custom paper size, either fitting the content or stretching it, and keep landscape pages landscape. https://yantrastack.com/articles/add-margin-to-pdf-pages/ https://yantrastack.com/articles/add-margin-to-pdf-pages/ Thu, 08 Oct 2026 00:00:00 GMT Add white space around PDF pages, either by growing the page or shrinking the content, in mm, cm, inches or points. https://yantrastack.com/articles/add-watermark-to-pdf-free/ https://yantrastack.com/articles/add-watermark-to-pdf-free/ Wed, 07 Oct 2026 00:00:00 GMT Stamp text on every page of a PDF, as one large mark or repeated across the page, with your own opacity, angle and colour. https://yantrastack.com/articles/remove-page-numbers-from-pdf/ https://yantrastack.com/articles/remove-page-numbers-from-pdf/ Tue, 06 Oct 2026 00:00:00 GMT Cover old page numbers or header and footer text with a clean strip in the colour of the page, for chosen pages. https://yantrastack.com/articles/add-page-numbers-to-pdf/ https://yantrastack.com/articles/add-page-numbers-to-pdf/ Mon, 05 Oct 2026 00:00:00 GMT Stamp page numbers on any PDF with your choice of format, font, position and start number. Supports i, ii, iii and mirrored print layouts. https://yantrastack.com/articles/delete-blank-pages-from-scanned-pdf/ https://yantrastack.com/articles/delete-blank-pages-from-scanned-pdf/ Sun, 04 Oct 2026 00:00:00 GMT Detect and delete empty pages from scans and exports with an adjustable strictness setting, then download a cleaned PDF. https://yantrastack.com/articles/duplicate-pages-in-a-pdf/ https://yantrastack.com/articles/duplicate-pages-in-a-pdf/ Sat, 03 Oct 2026 00:00:00 GMT Repeat selected PDF pages one or more times, placing the copies right after each page or at the end. Done locally in your browser. https://yantrastack.com/articles/qr-code-with-logo-error-correction/ https://yantrastack.com/articles/qr-code-with-logo-error-correction/ Fri, 02 Oct 2026 00:00:00 GMT Understand the four error correction levels in QR codes, what size and colours scan reliably, and when to choose PNG or SVG. https://yantrastack.com/articles/reverse-pdf-page-order/ https://yantrastack.com/articles/reverse-pdf-page-order/ Fri, 02 Oct 2026 00:00:00 GMT Flip a PDF so the last page comes first. Useful for scans made in the wrong order and for printing in reverse. One click, no upload. https://yantrastack.com/articles/make-wifi-qr-code/ https://yantrastack.com/articles/make-wifi-qr-code/ Thu, 01 Oct 2026 00:00:00 GMT Create a QR code with your network name and password, so phones join Wi-Fi in one scan. Free, private, with PNG and SVG downloads. https://yantrastack.com/articles/rotate-pdf-pages-permanently/ https://yantrastack.com/articles/rotate-pdf-pages-permanently/ Thu, 01 Oct 2026 00:00:00 GMT Fix sideways or upside-down pages in a PDF by 90, 180 or 270 degrees, for all pages or only the ones you choose, and save the change. https://yantrastack.com/articles/generate-random-passwords-for-websites/ https://yantrastack.com/articles/generate-random-passwords-for-websites/ Wed, 30 Sep 2026 00:00:00 GMT Fix "password rejected" problems: set length, character types, start-with-a-letter and excluded characters, then generate several options. https://yantrastack.com/articles/organize-pdf-pages-drag-and-drop/ https://yantrastack.com/articles/organize-pdf-pages-drag-and-drop/ Wed, 30 Sep 2026 00:00:00 GMT Use a page grid to drag pages into a new order, rotate, duplicate or delete them, then save a new PDF. Private, in your browser. https://yantrastack.com/articles/extract-pages-from-pdf/ https://yantrastack.com/articles/extract-pages-from-pdf/ Tue, 29 Sep 2026 00:00:00 GMT Keep only the pages you need from a PDF, such as one chapter or a signature page, and save them as a new file in your browser. https://yantrastack.com/articles/strong-password-guidelines/ https://yantrastack.com/articles/strong-password-guidelines/ Tue, 29 Sep 2026 00:00:00 GMT A practical guide to password strength: why length beats complexity, how to use a generator, and the habits that actually protect your accounts. https://yantrastack.com/articles/check-colour-contrast-and-convert-hex-rgb/ https://yantrastack.com/articles/check-colour-contrast-and-convert-hex-rgb/ Mon, 28 Sep 2026 00:00:00 GMT Convert any colour between HEX, RGB and HSL and see its contrast ratio against white and black with AA and AAA grades for readable design. https://yantrastack.com/articles/remove-pages-from-pdf-free/ https://yantrastack.com/articles/remove-pages-from-pdf-free/ Mon, 28 Sep 2026 00:00:00 GMT Remove unwanted pages from a PDF by typing page numbers or ranges. The result is a new file; your original stays untouched. https://yantrastack.com/articles/convert-unix-timestamp-to-date/ https://yantrastack.com/articles/convert-unix-timestamp-to-date/ Sun, 27 Sep 2026 00:00:00 GMT Turn 1700000000 or an ISO date into readable time in UTC, local time and any time zone, and learn seconds versus milliseconds. https://yantrastack.com/articles/split-pdf-into-separate-files/ https://yantrastack.com/articles/split-pdf-into-separate-files/ Sun, 27 Sep 2026 00:00:00 GMT Split a PDF by page ranges, every N pages or into single pages, then download each part or one ZIP. All in your browser. https://yantrastack.com/articles/count-words-characters-reading-time/ https://yantrastack.com/articles/count-words-characters-reading-time/ Sat, 26 Sep 2026 00:00:00 GMT Get live word, character, sentence and paragraph counts plus reading and speaking time, and see your most-used words. https://yantrastack.com/articles/merge-pdf-files-without-uploading/ https://yantrastack.com/articles/merge-pdf-files-without-uploading/ Sat, 26 Sep 2026 00:00:00 GMT Combine several PDFs into one in your browser, set the order by dragging, and keep the files private on your own device. https://yantrastack.com/articles/convert-text-case-camel-snake-kebab/ https://yantrastack.com/articles/convert-text-case-camel-snake-kebab/ Fri, 25 Sep 2026 00:00:00 GMT Switch between UPPER, lower, Title, Sentence, camel, Pascal, snake, kebab, dot.case, Train-Case, URL slugs and more with one paste. https://yantrastack.com/articles/compare-two-texts-find-differences/ https://yantrastack.com/articles/compare-two-texts-find-differences/ Thu, 24 Sep 2026 00:00:00 GMT Paste an original and an edited version, and see added and removed lines marked with plus and minus signs. Good for contracts, config files and drafts. https://yantrastack.com/articles/test-regular-expressions-online/ https://yantrastack.com/articles/test-regular-expressions-online/ Wed, 23 Sep 2026 00:00:00 GMT Enter a pattern and flags, paste sample text and see every match, its position and capture groups. Includes useful patterns and common pitfalls. https://yantrastack.com/articles/generate-uuid-v4-v7/ https://yantrastack.com/articles/generate-uuid-v4-v7/ Tue, 22 Sep 2026 00:00:00 GMT Generate random v4 or time-ordered v7 UUIDs in bulk, with or without hyphens, and learn when each version is the better choice. https://yantrastack.com/articles/generate-sha256-hash-online/ https://yantrastack.com/articles/generate-sha256-hash-online/ Mon, 21 Sep 2026 00:00:00 GMT Create SHA-256, SHA-512, SHA-384 or SHA-1 hashes, add a secret key for HMAC, and learn why hashing is not password storage. https://yantrastack.com/articles/url-encode-decode-percent-encoding/ https://yantrastack.com/articles/url-encode-decode-percent-encoding/ Sun, 20 Sep 2026 00:00:00 GMT Understand percent-encoding, the difference between encoding a component and a whole URI, and decode %20-style text in your browser.