BrowserTools

186+ free browser tools — nothing uploads, nothing signs up.

Private — files stay on your device, nothing uploads

Random generators, file converters, calculators, image & PDF tools, text utilities and more. No signup and free to use — most tools run locally on your device with no upload, and the few that need a network service say so plainly.

Search 186+ tools…⌘K / Ctrl+K
Instant
No queue, no upload wait
Private
Files never leave your device
No account
Nothing to sign up for
Offline-friendly
Runs client-side, always

Featured tools

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Random Password Generator

Strong, unguessable passwords with custom rules

Case Converter

UPPER, lower, Title, camelCase, snake_case & more

Base64 Encoder / Decoder

UTF-8-safe Base64 encode and decode

PNG to JPG Converter

Convert PNG images to JPG with quality control

PDF to JPG Converter

Render PDF pages as JPG images

MP4 to MP3 Converter

Extract audio tracks from video files

Browse all 186+ tools

Every category, every tool — free to use, most running in your browser.

PDF Tools

6 tools

View all PDF

Convert PDFs to images or text, merge, split and build PDFs from images — entirely on your device.

Show all 6 PDF tools
View all Time

Stopwatch, countdown timers, pomodoro, world clock, typing test and everything else that keeps you on track.

Show all 8 Time tools
View all Fun

Fancy text styles, zodiac signs and other playful utilities that are just too useful to skip.

Show all 1 Fun tools

Guides & deep dives

16 editorial guides — from image conversion without upload to NIST password rules. No filler, each links to 2–3 tools and back.

units

Feet and Inches to Centimeters: Height Explained

A height like 5′10″ is a pair of numbers, not a decimal: five feet plus ten inches, with the feet converting at 30.48 centimeters and the inches at 2.54. The arithmetic, the four mistakes that corrupt height records, and the settings where precision actually matters are below; to convert one height in either direction, the height converter linked from this guide gives the exact pair instantly.

6 min read·Read →
image

Favicon Sizes: What Your Website Actually Needs

A favicon is one small square of artwork that a browser requests at particular sizes, so a site needs a few purpose-built renditions rather than a single export scaled into every slot. Which pixels each context asks for, why a multi-size .ico still earns its place, and how the pieces are declared is below; to build the whole set from one image, the favicon generator linked from this guide produces the files and the tags.

6 min read·Read →
text

ASCII Art: How Text Pictures Are Made

ASCII art is a picture assembled from ordinary printable characters, with each glyph's weight standing in for a pixel's brightness. The style grew out of typewriters and bulletin boards and never left, because plain text renders everywhere. How the mapping works and which controls shape it is below; to draw a banner from a word rather than an image, the ASCII Text Generator on this site renders it in a classic font.

6 min read·Read →
Image & Privacy

Do Image Converters Upload Your Photos?

A converter that runs inside the page decodes your file into memory and re-encodes it there, so nothing is sent anywhere and you can check that claim yourself in the Network tab. That is a different promise from a server-side tool, where the photo lands on hardware you do not control. What each format costs, and how to verify it, is below; to convert a file now, the PNG to JPG converter linked from this guide works in the browser.

5 min read·Read →
webdev

PX vs REM vs EM: Which Unit Belongs Where

px ignores the font size a reader has set, rem follows the root element, and em follows the parent, so nesting em compounds while rem never surprises you. That single difference is the whole accessibility case for font-size guidance, and it is what decides where each unit belongs in a layout. The rule of thumb, the arithmetic and the traps are below; to convert one specific value, the PX to REM converter linked from this guide does it instantly.

4 min read·Read →
webdev

How to Choose QR Code Error Correction Level (L, M, Q, H)

L gives capacity, H gives resilience. Learn which level survives logos, dirt, and low light without making the code unruly.

6 min read·Read →
View all 16 guides

Why BrowserTools?

Your files stay yours

Other converters upload your photos and documents to servers you can't see. Here, conversion, compression and background removal all happen on your own device — private by architecture, not by promise.

No paywalls, no accounts

Every one of the tools is free with no signup, no email, no watermark and no daily limit. Bookmark the ones you love and use them forever.

Fast on any connection

Pages are static and lightweight, tools load on demand, and most of them keep working even if your connection drops mid-task.

About BrowserTools

BrowserTools is a collection of free online browser tools that run entirely on your own device. It exists because everyday tasks — converting an image, merging a PDF, checking a hash, or generating a password — should not require uploading files to a server, signing up for an account, or waiting for a page to load. Nothing here asks for your email, and nothing is stored on a remote server. What you paste, drop, or type stays in your browser tab and is gone when you close it.

Most tools process everything locally using JavaScript and WebAssembly, so they keep working even with a spotty connection. A small number of network tools — such as IP lookup and speed test — necessarily contact a service, and each of those says exactly what it sends on its own page. The site is for anyone who wants quick, private tools without an account: developers, students, designers, and anyone handling personal files they would rather not upload.