Free Online Web Tools — 302 Browser-Based Utilities

Browse 302 free online tools for developers, designers, and everyday tasks. All run in your browser with no sign-up required. Privacy-first, always free.

302 tools

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Format & pretty-print JSON

Convert JSON to CSV

Compare two JSON objects

JSON to TypeScript

Generate TS interfaces

Generate Python dataclass

JSON Path Finder

Find JSONPath for values

Convert YAML and JSON

Format YAML files

Format XML documents

Format SQL queries

Test regular expressions

Regex Generator

Generate regex from tests

Decode JWT tokens

Create JWT tokens

Hash Calculator

MD5 SHA1 SHA256 hashes

Create HMAC signatures

Time-based OTP codes

Password Checker

Check password strength

Password Generator

Generate strong passwords

Encoder / Decoder

Base64 URL encode decode

HTML Entity Encoder

Encode decode HTML entities

Encode files to base64

Build cron expressions

Decode cron to text

Mock REST API endpoints

CIDR Calculator

Calculate IP ranges

Compare code side by side

Beautify code snippets

Format CSS files

Format JavaScript files

Format HTML files

Html to Markdown

Convert HTML to Markdown

Markdown to HTML

Convert Markdown to HTML

Markdown Editor

Live Markdown editor

Create Markdown tables

Markdown Cheat Sheet

Quick Markdown reference

Markdown to Word

Convert Markdown to DOCX

Markdown Linter

Lint & format Markdown

Markdown to Plain Text

Strip Markdown to text

Compare Markdown files

Generate UUIDs v4

UUID v7 Generator

Sortable UUID with timestamp

Convert data formats

MIME Type Lookup

Find MIME types

Timestamp Converter

Unix timestamp converter

Robots.txt Generator

Create robots.txt

Generate XML sitemaps

Dockerfile Generator

Generate Dockerfiles

.gitignore Generator

Generate .gitignore

.htaccess Generator

Generate .htaccess

Favicon Generator

Create favicons

Schema Generator

JSON-LD structured data

Meta Tag Generator

Create SEO meta tags

Open Graph Generator

OG tags for social media

Check CORS headers

SPF DMARC DKIM builder

Generate file hashes

Minify HTML code

HTTP Status Codes

Reference HTTP codes

Mail Header Analyzer

Parse email headers

Keyboard Shortcut Finder

Find shortcuts by key

Regex Cheat Sheet

Quick regex reference

Sitemap Generator

Generate XML sitemaps

Text Comparator

Compare text blocks

Analyze HTTP Archive files

Morse Code Translator

Translate text to Morse code

Truth Table Generator

Boolean logic truth tables

IM Image

Image to Base64

Encode images as base64

Image Compressor

Reduce image file size

Convert PNG to JPG

Convert JPG to PNG

Convert WebP images

Resize images online

Rotate images free

Crop images with aspect ratio

Image to Grayscale

Make photos black white

Pixel Art Generator

Convert to pixel art

Image Color Palette

Extract colors from photo

Get dominant image colors

Placeholder Image

Generate placeholder images

QR Code Generator

Create QR codes

Scan QR codes from images

Barcode Generator

Generate barcodes

Barcode Scanner

Read barcodes from images

Image Metadata Editor

EXIF viewer edit strip photo metadata

Convert images to SVG

Optimize SVG files

Base64 to Image

Decode Base64 to image

Convert images to ASCII art

Image Dithering

Retro dithering effects

DS Design

Color Converter

Hex RGB HSL conversion

Color Contrast Checker

WCAG contrast tester

Generate color palettes

Color Name Finder

Get CSS color names

Create color palettes

Color Blindness

Simulate color blindness

Convert HEX to RGBA

Convert RGBA to HEX

Blend two colors

Generate color shades

Gradient Generator

Create CSS gradients

Shadow Generator

Generate box shadows

CSS text shadow effects

Visual border radius

Clip-Path Generator

CSS clip-path maker

Find font combinations

Google Fonts Preview

Preview Google Fonts

Search Font Awesome icons

Placeholder Image

Generate placeholder images

CS CSS Tools

CSS Grid Generator

Build CSS grid layouts

Flexbox Playground

Interactive flexbox

Box Model Calculator

Visualize CSS box model

Transition Generator

Create hover effects

Button Generator

CSS button maker

DV Data Viz

Charts from CSV data

Live diagram editor

Flowchart Maker

Create flowcharts

Mind Map Creator

Build mind maps

Network Diagram

Draw network topology

Create flow diagrams

Treemap Generator

Visualize hierarchy

Hierarchical connections

XY scatter charts

Spider web charts

Interactive network graphs

Project timeline

TX Text

Count words and characters

Text Summarizer

Summarize text online

Analyze word usage

Find and copy emojis

Change text case

Compare text differences

Find replace in text

Readability Score

Flesch reading ease

Text Statistics

Readability word count

Reverse text strings

Duplicate Line Remover

Remove duplicate lines

Whitespace Remover

Remove extra whitespace

General text cleanup

Duplicate Words Remover

Remove repeated words

Empty Lines Remover

Remove blank lines

Extra Spaces Remover

Collapse extra spaces

Line Break Remover

Join lines together

Trim text edges

Punctuation Remover

Strip punctuation

Diacritics Remover

Non-Alphanumeric Remover

Sort lines alphabetically

Create URL slugs

Generate placeholder text

Convert text to audio

Transcribe audio

Text to Handwriting

Convert to handwriting

Citation Generator

Create citations

Resume Formatter

Cover Letter Generator

Write cover letters

Flashcard Maker

Study with flashcards

BU Business

Invoice Generator

Create professional invoices

Receipt Generator

Generate receipts

Letterhead Generator

Design letterheads

Email Signature

Create email signatures

VCard Generator

Create vCard files

Task management

Weekly habit checklist & tracker

Focus timer technique

Decision Matrix

Weighted decision matrix

Currency Converter

Pricing Calculator

Product pricing

Calculate freelance rate

Calculate meeting cost

Work Hours Calculator

Track work hours

Time Card Calculator

Calculate time cards

Salary Converter

Annual to hourly salary

Meeting Scheduler

Find meeting times

Random team generator

Business Valuation

Estimate business value

Marketing Budget

Plan marketing spend

FN Finance

Mortgage Calculator

Home loan payments

Rent vs Buy Calculator

Should you rent or buy?

Loan Calculator

Loan payment calculator

Compound Interest

Compound interest calc

Retirement Calculator

Plan your retirement

Net Worth Calculator

Track assets liabilities

Inflation Calculator

Purchasing power over time

Debt Payoff Calculator

Snowball vs avalanche

Paycheck Calculator

Take home pay calculator

Return on investment

Split tips evenly

Discount Calculator

Calculate discounts

Sales Tax Calculator

Calculate sales tax

Find tax brackets

Break-Even Analysis

Break-even point

Percentage Calculator

Calculate percentages

Savings Goal Planner

Track savings goals

Envelope budgeting & rollover

Subscription Analyzer

Track recurring expenses

Expense Splitter

Split group expenses

Loan Comparison

Compare two loans side by side

Mortgage Comparison

Compare mortgages with PITI

FIRE Calculator

Financial independence number

Coast FIRE Calculator

How much you need to coast

Lean FIRE Calculator

Minimalist early retirement

Fat FIRE Calculator

Luxury early retirement

Barista FIRE Calculator

Part-time work + portfolio

Reverse FIRE Calculator

Required savings for target age

Withdrawal Rate Calculator

Test portfolio longevity

Savings & Investment Rate

Growth of consistent investing

Healthcare Gap Calculator

Early retirement healthcare costs

Retirement Cash Flow

Multi-account withdrawal plan

Find your best FIRE strategy

TD Time & Date

Timezone Converter

Convert timezones

Current time worldwide

Unix time converter

Countdown Timer

Set countdown alarms

Precise stopwatch

Date Difference

Days between dates

Countdown to any date

Calculate exact age

Count working days

Due Date Calculator

Pregnancy due date

Date Picker Formatter

Format date strings

Cron Cheat Sheet

Quick cron reference

MS Math

Convert any unit

Equation Solver

Solve equations

Graphing Calculator

Scientific Calculator

Scientific math

Matrix Calculator

Matrix operations

Fraction Calculator

Fraction arithmetic

Percentage Calculator

Percentage math

GCD and LCM finder

Standard Deviation

Statistical deviation

Probability Calculator

Calculate probability

Roman Numeral Converter

Roman numeral convert

Number base convert

Interactive elements

Sudoku Generator

Create Sudoku puzzles

Sudoku Assistant

Learn solving techniques

NYT Sudoku Resolver

Solve NYT daily Sudoku

HE Health

Body mass index

Calorie Calculator

Daily calorie needs

Workout Generator

Personalized workout plans

Running pace convert

PD PDF

Combine multiple PDFs

Split PDF by pages

PDF Page Reorder

Drag-drop reorder pages

PDF Rotate Pages

Rotate PDF pages

PDF Delete Pages

Remove pages from PDF

PDF Extract Pages

Extract pages to new PDF

Add text watermark

PDF Page Numbers

Add page numbers

PDF Metadata Viewer

View PDF properties

PDF Form Filler

Markdown to PDF

Convert Markdown to PDF

Convert HTML to PDF

Convert images to PDF

Convert text to PDF

Convert PDF pages to PNG

AU Audio

Record from microphone

Cut trim audio files

MP3 to MIDI Converter

Transcribe audio to MIDI

Audio Converter

Convert audio formats

Find the tempo of audio

Volume Normalizer

Normalize audio loudness

Chord Identifier

Identify chords from notes

Find scales from notes

Live browser synthesizer

Euclidean Rhythm

Generate rhythm patterns

Melody Generator

Generate melodic ideas

Adjustable tempo

Play audio frequencies

Audio Visualizer

Visualize sound waves

VI Video

Audio File Size Calculator

Estimate audio file sizes by bitrate and duration

Subtitle Shifter

Shift SRT/VTT subtitle timing forward or backward

Video Info Inspector

View codec, resolution, bitrate and metadata

Video Thumbnail Extractor

Extract frames as PNG/JPG/WebP from any video

Remove audio from video streams

Video Audio Extractor

Extract audio track from video files

Cut and trim video clips with preview

Video Converter

Convert between MP4 and WebM formats

Video Compressor

Reduce video file size with quality presets

Convert video clips to animated GIFs

CR Crafters

Soap Calculator

Lye & oil recipe calculator

Candle Calculator

Wax, fragrance & wick calc

Scale recipes up or down

Cure Calculator

Track cure times

Fragrance Calculator

Fragrance oil calculator

Label Generator

Product label maker

Cost Calculator

COGS, pricing & margins

TS Test

Reaction Time Test

Measure your reflexes

Typing Speed Test

Test your typing WPM

Number Memory Test

Test your digit span

Sequence Memory Test

Test your visual pattern recall

Test cognitive interference

Mental Math Test

Test arithmetic speed

Click Speed Test

Measure clicks per second

Word Unscramble Test

Solve scrambled words

Find the odd emoji

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