100+ Free Online Tools — Instant. Unlimited. Forever Free.

Altairys is the most useful free online toolkit — trusted daily by developers, students, designers and professionals. Image compressors, PDF utilities, calculators, developer tools, text utilities and more. Everything runs in your browser; your data never leaves your device.

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100+Free Tools

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∞Free Forever

100%Browser-based

Image Compressor

Compress images without losing quality

QR Code Generator

Generate QR codes for any URL or text

Age Calculator

Calculate exact age from date of birth

Word Counter

Count words, characters and sentences

BMI Calculator

Check your Body Mass Index instantly

EMI Calculator

Calculate loan EMI with interest rates

Password Generator

Generate strong secure passwords

JSON Formatter

Format and validate JSON data

Color Picker

Pick colors and get HEX, RGB, HSL codes

Base64 Encoder

Encode and decode Base64 strings

Image Resizer

Resize images to any dimension instantly

JPG to PNG Converter

Convert JPG images to PNG format

Percentage Calculator

Calculate percentages quickly and easily

URL Encoder / Decoder

Encode or decode URLs and query strings

Hash Generator

Generate MD5, SHA-1, SHA-256 hashes

Text to Speech

Convert text to natural sounding audio

Image to PDF

Merge images into a PDF document

Stopwatch & Timer

Precision stopwatch with laps and countdown timer

Number to Words

Convert numbers to Indian format words (Lakh, Crore)

Unit Converter

Convert length, weight, temperature and more

CSS Border Colors

148+ CSS named colors with live border previews

CSS Shadow Generator

Generate box & text shadows with 100+ presets

CSS Gradient Generator

Create linear, radial & conic gradients with 120+ presets

CSS Loaders

100+ pure CSS loading animations with copy code

Lorem Ipsum Generator

Generate placeholder text as paragraphs, sentences, words or HTML

Timestamp Converter

Convert Unix timestamps with live clock and 40+ timezone support

JavaScript Interview Q&A

600+ JavaScript interview questions for all levels

JWT Decoder

Decode & inspect JWT tokens — header, payload, claims and expiry

Regex Tester

Build and test regular expressions with live match highlighting

Diff Checker

Compare two texts side-by-side with highlighted differences

CRON Generator

Build CRON expressions visually with next run preview

HTML Entity Encoder

Encode/decode HTML entities with full reference table

UUID Generator

Generate v4, v1, v7 UUIDs in bulk with validation

HTTP Status Codes

Complete HTTP status code reference — 1xx to 5xx with use cases

Markdown Preview

Write and preview Markdown with live rendering and export

Meta Tag Generator

Generate SEO, Open Graph and Twitter Card meta tags instantly

Color Converter

Convert colors between HEX, RGB, HSL, HSV, CMYK with palette generator

JSON ↔ CSV Converter

Convert JSON to CSV and CSV to JSON instantly with live preview

SQL Formatter

Format, minify and highlight SQL queries with configurable style

Character Encoder

Encode/decode text in Binary, Hex, Base64, Morse code, Unicode and more

Currency Converter

Live currency converter with real-time exchange rates for 30+ currencies

Screen Resolution Tester

Detect screen resolution, viewport size, DPI, device type and browser info

Readability Checker

Analyse text readability with Flesch, SMOG, Gunning Fog and 4 more scores

Case Converter

Convert text between UPPER, lower, Title, camelCase, snake_case, kebab-case and 10 more

String Escaper

Escape and unescape strings for JavaScript, HTML, JSON, SQL, Regex, CSV and XML

Slug Generator

Convert titles and text into clean URL-friendly slugs with transliteration support

Text Repeater

Repeat any text N times with custom separator, line numbers and download option

SVG to PNG Converter

Convert SVG files to high-resolution PNG with custom scale and background color

WebP Image Converter

Convert PNG, JPG and WebP images to any format in bulk with quality control

Image Color Extractor

Extract dominant color palette from any image with HEX, RGB and HSL codes

Favicon Generator

Generate favicons in all standard sizes from an image, emoji or letter

Image Cropper

Crop images with precision — set coordinates, aspect ratio and output format

Text Summarizer

Automatically extract the most important sentences from any text

Palindrome Checker

Check if a word or phrase is a palindrome and find palindromic words

Text Formatter & Cleaner

Remove extra spaces, blank lines, HTML tags, punctuation and more from text

Find & Replace

Multi-rule find and replace with regex, case sensitivity and whole-word matching

Word Frequency Analyzer

Analyse word and letter frequency in text with visual bar charts and stats

Image Flip & Rotate

Flip images horizontally or vertically, rotate by 90°/180°/270° and download as PNG, JPEG or WebP

Image Filters

Apply grayscale, sepia, blur, brightness, contrast, saturation and 10 instant presets to images

Image to Base64

Convert images to Base64 data URIs or decode Base64 back to images with HTML and CSS snippets

Background Remover

Remove solid-colour backgrounds from images with threshold control, corner sampling and edge feathering

Pixel Art Generator

Transform any image into pixel art with custom block size, palette reduction and optional grid outline

Flexbox Generator

Visually configure CSS Flexbox — direction, wrap, justify, align and per-item properties with live preview

CSS Grid Generator

Build CSS Grid layouts visually — define columns, rows, gaps, alignment and copy generated CSS

CSS Animation Generator

Generate CSS animations with 16 presets. Customise duration, timing, delay, iterations and fill mode

CSS Filter Generator

Generate CSS filter values with live preview — blur, brightness, contrast, grayscale, hue-rotate and more

HAR File Analyzer

Deep-inspect HTTP Archive files. Waterfall timeline, charts, domain analysis, security audit and performance insights.

PDF Password Remover

Remove password protection and permissions restrictions from PDF files. 100% browser-based.

PDF Merger

Combine multiple PDF files into one document. Drag to reorder, then merge.

PDF Splitter

Extract pages from a PDF by custom ranges or split every page into its own file.

PDF to Images

Convert every PDF page to a high-resolution PNG or JPEG image instantly.

PDF Compressor

Reduce PDF file size by re-rendering pages at optimised quality. Screen, eBook or Print.

PDF Watermark

Stamp a custom text watermark on every page of a PDF. Set color, opacity and position.

XML Formatter

Format and beautify XML or minify it with configurable indentation

YAML ↔ JSON Converter

Convert between YAML and JSON formats with live validation

Number Base Converter

Convert between binary, octal, decimal and hexadecimal

CSS Clip-Path Generator

Generate CSS clip-path values for inset, circle, ellipse and polygon shapes with 10 polygon presets

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Image ToolsCompress, Resize, Convert

PDF ToolsConvert, Remove Password

CalculatorsAge, BMI, EMI & more

Developer ToolsJSON, JWT, Hash, Base64

FinanceStocks, MF & FD Rates

GamesFree Mini Games