Free Online File Tools - Nothing Leaves Your Browser

Convert, compress, format, and decode files with zero uploads. Every tool runs entirely in your browser - your files and data never touch a server.

Image tools

JPG to PNG

Convert JPG images to PNG format instantly in your browser

Image Compressor

Compress JPG, PNG and WebP images without losing quality

Image to ASCII Art

Convert any image into text-based ASCII art with adjustable detail

PDF tools

Merge PDF

Combine multiple PDF files into one document

Developer tools

JSON Formatter

Format, validate and minify JSON instantly

Base64 Encoder / Decoder

Encode and decode Base64 strings online

URL Encoder / Decoder

Encode and decode URL strings and query parameters

HTML Entities Encoder / Decoder

Convert special characters to HTML entities and back

Regex Tester

Test JavaScript regular expressions with live match highlighting

Hash Generator

Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text and files

UUID Generator

Generate random UUIDs (v4) and timestamp-ordered UUIDs (v7) in bulk

JWT Decoder

Decode and inspect a JWT's header, payload and claims online. Runs 100% in your browser - your tokens are never uploaded or sent to any server.

Markdown to HTML Converter

Convert Markdown to HTML or HTML to Markdown online, with live preview. Runs 100% in your browser - nothing is uploaded.

QR Code Generator

Generate QR codes for URLs, text, Wi-Fi, vCard and more - download PNG/SVG

JSON to YAML Converter

Convert JSON to YAML or YAML to JSON online, with live preview and validation. Runs 100% in your browser - your data is never uploaded.

JSON to CSV Converter

Convert JSON to CSV or CSV to JSON online, with auto-detected headers. Runs 100% in your browser - your data is never uploaded.

Text Diff Checker

Compare two texts side-by-side with line, word and character diff

Slug Generator

Convert any text into a URL-friendly slug - handles diacritics and Unicode

Meta Tag & Open Graph Generator

Generate SEO meta tags, Open Graph and Twitter Card markup for any page

Text tools

Case Converter

Convert text between UPPERCASE, lowercase, camelCase, snake_case and more

Word Counter

Count words, characters, sentences, paragraphs and reading time

Lorem Ipsum Generator

Generate Lorem Ipsum, Bacon Ipsum, Hipster and other placeholder text

Password Generator

Generate strong random passwords and passphrases - 100% private

Text to Speech

Read any text aloud using your browser's built-in voices

Color tools

Color Converter

Convert colors between HEX, RGB, HSL, HSV and CMYK formats

Color Palette Generator

Generate harmonious color palettes - complementary, triadic, analogous, monochrome

CSS Gradient Generator

Generate beautiful linear and radial CSS gradients with live preview

Contrast Checker

Check WCAG contrast ratios for accessible color combinations

Color Blindness Simulator

Preview images and colors as seen by users with color vision deficiency

Utility tools

Unix Timestamp Converter

Convert between Unix timestamps and human-readable dates

Timezone Converter

Convert times between cities and IANA timezones with DST awareness

Cron Expression Parser

Parse cron expressions, see human-readable explanation and next run times

Number Base Converter

Convert numbers between binary, octal, decimal, hexadecimal and any base 2-36

Roman Numerals Converter

Convert between Roman numerals and Arabic numbers (1-3999)

CSS Units Converter

Convert between PX, REM, EM, PT, %, vh, vw - keep typography consistent

Aspect Ratio Calculator

Calculate proportional dimensions for any aspect ratio (16:9, 4:3, 1:1, etc.)

Screen Resolution & Browser Info

Detect your screen resolution, viewport, color depth, DPR and more

Pomodoro Timer

Browser-based Pomodoro and countdown timer with session tracking

Favicon Generator

Create a favicon from emoji, initials or an uploaded image - all sizes included

How it works

1
Choose a tool

Pick the tool you need from the list above.

2
Open your file

Drag & drop your file onto the page or click to browse.

3
Download the result

Your processed file is ready instantly - click Download to save it.

Why Filesty?

🔒
100% Private

Your files are processed directly in your browser. Nothing is ever uploaded to any server.

⚡
Instant Results

No waiting for uploads or server processing. Tools run at full speed on your device.

🆓
Always Free

All tools are completely free to use. No account required, no hidden fees.

🌍
Works Everywhere

Any browser, any device. No software to install, no plugins required.

What is Filesty?

Filesty is a collection of free online file and developer tools that run entirely in your browser using JavaScript and WebAssembly. Unlike most online converters, nothing you open is ever uploaded: your files are read, processed, and saved locally on your own device. You can confirm it yourself - open your browser's Network tab and you'll see no file ever leaves the page. That means no server sees your images, PDFs, JSON, or tokens, there are no upload size limits, and every tool works instantly and even offline once the page has loaded. No account, no file tracking, no hidden fees.

From the blog

View all articles ->

Frequently asked questions

Yes. Every tool on Filesty is free to use with no account, no sign-up, and no usage limits. There are no hidden fees or premium tiers.

No. All processing happens locally in your browser using JavaScript. Your files never leave your device and are never sent to any server.

Filesty supports JPG, PNG, and WebP for image tools; PDF for document tools; and plain text and JSON for developer utilities.

Yes. All tools are fully optimized for mobile browsers on iOS and Android. No app installation or browser plugin is required.