NoSend Tools
Tools that never send your data anywhere. Everything runs entirely inside your browser, and no input ever leaves your device.
Your input never leaves your browser
Browse by category
Pick a category to find the tool you need.
Audio
23 tools
Tools for working with audio files: recording, conversion, editing, transcription, and more.
Video
21 tools
Tools for processing video in your browser: convert, cut, merge, compress, and more.
Image
31 tools
Tools for working with images: conversion, resize, compression, EXIF stripping, background removal.
23 tools
Tools for PDFs: merge, split, reorder, unlock, strip metadata, and more.
Developer
87 tools
Day-to-day developer utilities: JSON, YAML, Base64, JWT, regex, diff, and more.
Japanese
17 tools
Tools for Japanese text: kanji to hiragana, kanji to romaji, and more.
Finance
21 tools
Tools for money and taxes: calculators and more.
Time
18 tools
Tools for time: world clock, Unix timestamp conversion, and more.
Convert
12 tools
Convert between units (length, weight, temperature, etc.) and numeric representations (binary, hex, octal).
Why NoSend Tools
Most online converters and editors are convenient — but most of them work by sending your file or text to a server. When you are dealing with confidential documents, files that contain personal information, or unpublished audio and video, that round trip is itself a risk, even when the service promises to delete the upload right after.
Every tool on NoSend Tools is different: your input never leaves your browser. All processing happens entirely on your device, using WebAssembly builds of ffmpeg, PDF libraries, and other open-source projects. You get desktop-class behavior with nothing more than a browser tab.
How it works
Browser-only processing
ffmpeg.wasm, pdf-lib, kuromoji and other well-known open-source libraries run inside your browser via WebAssembly, with no server in the loop.
No upload
Picking a file just hands the browser a local file reference. The tool's input is never sent over the network to any server.
No accounts
There are no sign-ups, no email entry, and no paid plans. Visit the site, pick a tool, start using it.
Open source
The site's source code and the list of libraries it uses are public. You can audit exactly what is running, any time.
FAQ
- Is my data really never sent anywhere?
- Yes. Every tool completes its work inside your browser. If you want to verify it, open your browser's devtools and watch network traffic. Other than the one-time download of tool code (WebAssembly and JavaScript), no input file or text is sent out.
- Is there a file size limit?
- There is no server-side limit. The real limit is your device's memory. A few hundred MB of video or PDF usually works fine if you have RAM available. For very heavy files, close other tabs to free memory.
- Which browsers are supported?
- Tested on the latest Chrome, Edge, Firefox, and Safari. Tools that need the microphone or AudioContext (like the voice recorder) work in all of those.
- Does it work offline?
- After you open a page once, tool code is cached locally, and many tools keep working offline. Tools that load large WebAssembly bundles (such as ffmpeg.wasm) need a connection for the first load only.
- Is it completely free?
- Yes. No sign-ups and no paid plans. Hosting costs are covered by advertising.
- Can I use it at work or for commercial purposes?
- Yes. Generated or converted results are used at your own risk — always verify important output in your own environment. See the Terms of Use for details.
- Where do I report bugs or request features?
- Use the "Report an issue or request" button at the bottom of each page, or the Contact page. New tools are added regularly based on requests.