Free online tools that never upload your files
Compress images, convert formats, merge PDFs and more — right inside your browser. No uploads, no sign-up, no waiting. Nothing to install, nothing stored anywhere.
🖼️ Image tools
Compress Image
Shrink JPG, PNG and WebP by quality and max dimensions — batch mode, zip download.
🔄Convert Image
Convert between PNG, JPG and WebP instantly, with optional resizing.
💧Add Watermark
Stamp text watermarks on batches of images — tile or place freely.
📱QR Code Generator
Create crisp QR codes for links, text and Wi-Fi logins. Download as PNG or SVG.
📄 Document tools
Merge PDF
Combine multiple PDFs into one document, in any order you choose.
✂️Split PDF
Extract page ranges or burst a PDF into single-page files.
🏞️PDF to Image
Turn PDF pages into sharp PNG or JPG images, with batch export.
📃DOCX to PDF
Convert Word documents to PDF right in your browser — no upload.
📝PDF to Word
Turn text PDFs into editable Word documents, locally.
📝 Text tools
💻 Developer tools
JSON to TypeScript
Paste JSON, get clean TypeScript interfaces — handles nesting and arrays.
{ }JSON Formatter
Beautify, minify and validate JSON with exact error positions.
🔐Base64 & URL
Unicode-safe Base64 and percent-encoding, encode or decode.
#️⃣Hash Calculator
MD5 and SHA hashes of text or files, with checksum verify.
🔑Password Generator
Cryptographically random passwords, generated locally.
🆔UUID Generator
Bulk UUID v4 identifiers — uppercase, braces and hyphen options.
⏱️Timestamp Converter
Unix time ↔ date, seconds or milliseconds, local or UTC.
🎨Color Converter
HEX, RGB and HSL conversions with a live preview.
Why LocalKit is different
- 🔒 Private by designEvery tool runs 100% in your browser using JavaScript and WebAssembly. Your files are never sent to — or stored on — any server. Offline? Most tools still work.
- ⚡ Instant resultsNo upload progress bars, no processing queues. Files are processed at your device's full speed, even large ones.
- 🆓 Free & unlimitedNo accounts, no watermarks, no daily limits, no “premium” upsells. Use every tool as much as you like.
Frequently asked questions
Are my files really never uploaded?
Correct. Each tool on LocalKit is a small program that runs inside your browser tab. When you pick a file, the browser reads it from your disk and processes it in local memory. There is no upload step at all — you can even disconnect from the internet and keep using most tools.
Is it really free?
Yes. LocalKit is free for everyone and funded entirely by voluntary donations — no ads, no tracking, no paywalls.
Which browsers are supported?
Any modern browser: Chrome, Edge, Firefox, Safari and Opera, on desktop and mobile. For the image tools we recommend a recent browser version for the best compression formats.
Can I use the tools on my phone?
Yes — the site is fully responsive and all tools work on Android and iOS browsers.