Free Browser Tools — Nothing Leaves Your Device

229+ free browser tools for PDF, images, text, code, media & conversions. Everything runs client-side — your files never leave your device.

AI-powered tools. 100% client-side. Zero uploads.

Documents & eBooks

  • PDF Tools — Split, merge, compress, convert, watermark, and transform PDF documents. (18 tools)
  • eBook Tools — Convert documents to EPUB for Kindle, Kobo, Apple Books, and more. (6 tools)

Images, Design & Fonts

  • Image Tools — Convert, compress, crop, filter, remove backgrounds, and edit images. (36 tools)
  • QR & Barcode — Generate, scan, and customize QR codes and barcodes. (3 tools)
  • Design & Color — Color pickers, palettes, CSS generators, and visual design tools. (6 tools)
  • Font Tools — Convert, subset, and transform font files — TTF, OTF, WOFF, and more. (5 tools)

GIF, Video & Audio

  • GIF Tools — Create, compress, resize, reverse, crop, and convert animated GIFs. (9 tools)
  • Video Tools — Convert, compress, trim, rotate, and edit video files. (23 tools)
  • Audio & Music — Convert, trim, merge, equalize, and create audio and music. (29 tools)

Text & Data

  • Text Tools — Diff, sort, format, encode, and transform text. (18 tools)
  • Converters — Convert between file formats, units, timestamps, and encodings. (28 tools)

Dev & Utilities

  • Developer Tools — JSON, code editing, regex, APIs, and developer utilities. (31 tools)
  • Utilities — Timers, calculators, generators, and everyday tools. (17 tools)

Popular Tools

  • Split PDF — Split a PDF into multiple files by page ranges.
  • Merge PDF — Combine multiple PDFs into a single document. Reorder pages with drag & drop.
  • Compress PDF — Reduce PDF file size by recompressing pages as images.
  • Background Remover — Remove image backgrounds with AI — runs entirely in your browser.
  • Image Compressor — Compress and resize images with format conversion and quality control.
  • Image Converter — Convert between PNG, JPEG, WebP. Resize and compress images — all in your browser.
  • HEIC to JPG — Convert iPhone HEIC photos to JPEG or PNG — instantly, in your browser.
  • Video to GIF — Convert video clips to animated GIFs with trim and crop.
  • Transparent Video — Remove backgrounds via AI or color keying. Export transparent WebM or mask side-by-side for full browser compatibility.
  • Text Diff — Compare two texts side by side. Highlight differences instantly.
  • Metadata Remover — Improve privacy & security with one-click metadata removal. 100% client-side — your files never leave your device.
  • Font Glyph Trimmer — Load fonts, preview all glyphs, and export a new font with only selected glyphs.

Frequently Asked Questions

What is SapienKit?

SapienKit is a free collection of 200+ browser-based tools for PDFs, images, audio, video, text, code, and more. Every tool runs entirely in your browser using JavaScript and WebAssembly — no server processing, no uploads, no accounts.

Are my files really private?

Yes. Your files never leave your device. All processing happens locally in your browser using client-side JavaScript and WebAssembly. There are no uploads, no server-side processing, and no data stored anywhere. Close the tab and everything is gone.

Is SapienKit really free?

100% free with no hidden paywalls, no premium tiers, and no usage limits. There are no watermarks on your output files either.

Do I need to create an account?

No. There is no sign-up, no login, and no email required. Just open a tool and start using it immediately.

Is there a file size limit?

There is no hard limit set by SapienKit. Since everything runs in your browser, the practical limit depends on your device's available memory and your browser. Most tools handle files up to a few hundred megabytes without issues.

Does it work offline?

Yes. Once the page has loaded, most tools work fully offline since all the code runs in your browser. You can even bookmark your most-used tools for quick access without an internet connection.

Which browsers are supported?

SapienKit works on all modern browsers including Chrome, Edge, Firefox, and Safari (latest versions). Some tools that use WebAssembly or advanced APIs work best on Chromium-based browsers.

How is this different from other online tools?

Most online tools upload your files to a server for processing. SapienKit does everything locally in your browser — zero uploads, zero watermarks, zero email gates, and zero ads. Your data stays on your device the entire time.