All Free Online Tools & Calculators
Complete, searchable directory of fast, 100% free, client-side tools for calculations, document workflows, image editing, text formatting, and web development.
Calculate Body Mass Index (BMI), category, and healthy weight range for metric and imperial units.
Multi-mode percentage tool supporting 6 modes with live worked examples.
Calculate total credit hours, grade points, and final GPA on standard 4.0 or custom scales.
Calculate original price, sale price, stacked discounts, sales tax, and tip.
Calculate periodic loan payments, total interest, and full amortization schedule.
Add or subtract dates, count exact differences, and compute Monday-Friday business days.
Format and beautify raw JSON with syntax highlighting and custom indentation.
Strip whitespace from JSON to reduce payload size for APIs and storage.
Validate JSON syntax and get detailed error messages with line numbers.
Convert JSON array data into comma-separated CSV files for spreadsheets.
Beautify and auto-indent messy HTML markup for readability.
Beautify and auto-indent CSS stylesheets for clean, readable code.
Beautify and auto-indent JavaScript source code for readability.
Beautify SQL queries with keyword capitalization and proper indentation.
Encode text to Base64 or decode Base64 back to plain text.
Generate cryptographically random UUID v4 identifiers in bulk.
Generate strong random passwords with configurable length and character sets.
Generate SHA-256, SHA-1, and SHA-512 cryptographic hash digests.
Test regex patterns against sample text with real-time match highlighting.
Decode JWT tokens and inspect header, payload, and expiration claims.
Encode special characters for safe URLs or decode percent-encoded strings.
Browse all HTTP response status codes with descriptions and use cases.
Generate downloadable QR codes from text, URLs, or structured data.
Write markdown with a live HTML preview side-by-side.
Convert colors between HEX, RGB, and HSL formats with live preview.
Generate configurable lorem ipsum placeholder text for design mockups.
Count words, characters, sentences, paragraphs, and reading time.
Count characters with and without spaces for tweets, SMS, and form fields.
Convert text between UPPER, lower, Title, Sentence, camelCase, and more.
Clean up extra spaces, tabs, and trailing whitespace from text.
Remove duplicate lines from text while preserving original order.
Search and replace text with support for case-sensitive and regex modes.
Compare two text blocks and highlight differences line by line.
Check grammar, spelling, and punctuation with fix suggestions.
Scan physical documents using camera, auto-detect edges, crop, filter, and compile into multi-page PDFs.
Build custom robots.txt files with user-agent directives and sitemap locations.
Generate valid XML sitemaps for submission to Google Search Console.
Create Schema.org JSON-LD markup for WebSite, FAQPage, Article, and Product schema.
Generate Open Graph and Twitter Card HTML meta tags for social media previews.
Analyze title, meta description, canonical, and heading hierarchy for any web URL.
Evaluate meta description length and pixel truncation limits (target: 120–160 chars).
Test page title tag lengths against 50–60 character Google truncation thresholds.
Calculate 1-word, 2-word, and 3-word keyword frequency percentages across content.
Trace HTTP 301/302 redirect chains to identify status codes and final destination URLs.
Query domain DNS records including A, MX, CNAME, TXT, and nameservers.
Verify SSL/TLS certificate validity, issuer, protocol, and expiration date.
Combine multiple PDF files into a single unified PDF document.
Separate PDF pages or extract custom page ranges into new PDF files.
Reduce PDF file size for email attachments and web upload limits.
Convert PDF files into editable Microsoft Word DOCX documents.
Extract PDF document pages as standalone high-resolution JPG images.
Convert PDF tabular data into editable Excel XLSX spreadsheets.
Convert Word DOCX files into standardized PDF documents.
Convert JPG or PNG photos into formatted multi-page PDF files.
Reorder, rotate 90°, delete, or insert pages inside existing PDF files.
Draw or upload a signature and burn it onto PDF document pages.
Stamp custom text watermarks across all PDF document pages.
Remove password restrictions from protected PDF documents.
Compress JPG, PNG, and WebP images locally with customizable quality controls.
Resize image pixel dimensions in real time with high-quality resampling.
Convert images between JPG, PNG, and WebP file formats.
Adjust image brightness, contrast, and color filters.
Convert length units (meters, feet, inches, kilometers, miles).
Convert mass and weight units (kg, lbs, oz, grams).
Convert temperature scales (°C, °F, Kelvin).
Convert velocity and speed units (km/h, mph, knots).
Convert liquid volume units (liters, gallons, cups, fl oz).
Convert surface area units (sq meters, sq feet, acres, hectares).
Convert digital storage metrics (Bytes, KB, MB, GB, TB).