Free Online Tools for SEO, Developers, Text, Images, Files & Calculators — No Sign Up

AES Encrypt/Decrypt

Encrypt and decrypt text with AES-GCM using the Web Crypto API.

Base64 Encode/Decode

Encode and decode text to and from Base64 format instantly.

Bcrypt Compare Tool

Compare a plaintext password against a bcrypt hash locally.

Bcrypt Generator

Generate bcrypt password hashes and compare passwords against hashes.

Hash Compare

Compare computed hashes against stored values across common algorithms.

JWT Decoder

Decode and inspect JSON Web Tokens to view header and payload.

JWT Signer

Create HS256 JWT tokens from a payload, headers, and secret.

MD5 Hash Generator

Generate MD5-style hash values from any text input.

Password Generator

Generate secure passwords with customizable length, numbers, and symbols.

Password Strength Checker

Score passwords for length, variety, and repetition risk without sending them anywhere.

QR Code Generator

Create QR codes for URLs, text, WiFi, and email with download options.

RSA Key Generator

Generate RSA-OAEP public and private keys in PEM format.

SHA-256 Hash Generator

Generate SHA-256 hash values with optional salt for enhanced security.

Base64 Image Encoder

Convert uploaded images directly into Base64 strings.

Class Diagram Maker

Draft Mermaid-compatible UML class diagrams with a browser-based editor and board preview.

Cron Expression Parser

Validate cron schedules and preview upcoming run times.

CSS Minifier/Formatter

Minify or beautify CSS code for optimization.

CSV to JSON Converter

Convert CSV data to JSON and vice versa with ease.

Data URI Generator

Generate inline data URIs from uploaded files and text assets.

Environment Variables Parser

Parse `.env` style content into structured JSON and key/value tables.

ER Diagram Maker

Create entity-relationship diagrams with schema notes, Mermaid output, and a visual board summary.

Flowchart Maker

Build process diagrams and flowcharts from Mermaid-style syntax with export-friendly output.

HTML to Markdown Converter

Convert raw HTML into readable markdown syntax.

HTML/XML Escape

Convert special characters to and from HTML entities.

JavaScript Minifier/Formatter

Minify or beautify JavaScript code for production.

JSON Formatter & Validator

Format, validate, and minify JSON with error highlighting.

JSON Path Finder

Search nested JSON objects and return matching paths for keys and values.

JSON Schema Builder & Validator

Generate JSON Schema from sample payloads, validate example objects, and inspect required fields or type mismatches. It is useful when teams need portable contracts without spinning up a backend.

JSON to XML Converter

Transform JSON objects into formatted XML markup.

Markdown to HTML Converter

Render markdown into clean sanitized HTML with a live preview.

Pretty Log Formatter

Clean up JSON logs, key-value lines, and stack traces for readability.

Query String Parser

Parse URLs and query strings into readable key-value parameters instantly.

Regex Escape Helper

Escape plain text safely for regular-expression literals and search patterns.

Sequence Diagram Maker

Visualize API and system interactions with Mermaid-compatible sequence diagram editing.

SQL Formatter

Format and beautify SQL queries for better readability.

SQL to JSON Converter

Turn SQL INSERT statements into JSON data structures.

URL Encode/Decode

Encode and decode URLs with percent-encoding support.

XML Formatter & Validator

Pretty-print XML and flag malformed markup in your browser.

YAML to JSON Converter

Convert between YAML and JSON formats instantly.

Alias Generator

Create usernames, pet names, and brand-style aliases instantly.

Binary/Text Converter

Convert plain text into binary and decode binary back to text.

Case Converter

Convert text between upper, lower, title, camel, and other casing styles.

Diff Checker

Compare two blocks of text and highlight additions and removals.

Leet Speak Converter

Turn text into 1337-style writing with adjustable intensity.

Lorem Ipsum Generator

Generate placeholder text in paragraphs, sentences, or words.

Morse Code Converter

Encode text as Morse code and decode Morse back into text.

Nonsense Word Generator

Generate playful made-up words for naming and brainstorming.

Palindrome Checker

Check whether a word or phrase reads the same backwards.

PDF to Word Converter

Extract text from PDF and convert it into a Word document.

Random Text Generator

Generate placeholder copy in multiple lengths and writing tones.

Regex Tester

Test regular expressions with live match highlighting.

Text Humain

Detect robotic writing patterns and rewrite text into a more natural, human-sounding draft.

Text Reverser

Reverse text by characters, words, or full line order.

Text to PDF Converter

Convert plain text to PDF documents with customizable page size.

Text to Word Converter

Generate Word documents (.docx) from plain text.

Unicode Converter

Encode and decode unicode escape sequences and code points.

Word & Character Counter

Count words, characters, sentences, and estimate reading time.

Word Cloud Generator

Create a quick SVG word cloud from any text input.

Word to PDF Converter

Convert Word documents to PDF format.

Background Remover

Remove image backgrounds in the browser with color picking, flood fill, and edge-aware controls.

Change Background

Replace image backgrounds with a solid color, gradient, or uploaded image using browser-based compositing.

Color Picker

Pick colors and convert between HEX, RGB, and HSL formats.

EXIF GPS Remover

Check image metadata for location, device, and timestamp details, then strip the fields you do not want to share. It is especially useful for press kits, listings, and personal photos shared publicly.

Favicon Generator

Generate favicon assets from an uploaded source image.

Image Batch Converter

Convert multiple images to JPG, PNG, or WebP and download them together.

Image Compressor

Compress images with adjustable quality and preview.

Image Converter

Convert images between JPG, PNG, WebP, ICO, and AVIF formats.

Image Cropper

Crop images with common aspect ratios and download the result.

Image Flipper

Flip images horizontally or vertically and export the result.

Image Metadata Viewer

Read EXIF and basic image metadata from uploaded files.

Image Resizer

Resize images to preset or custom dimensions.

Image Rotator

Rotate images by presets or custom angles in the browser.

Image to Base64

Convert images to Base64-encoded strings with preview output.

Image Watermarker

Add a text watermark to images with positioning controls.

Remove Background

Remove plain or studio-style backgrounds from images and export a transparent PNG locally.

Resize Image

Resize images to exact pixels, percentages, or social presets while keeping aspect ratio in the browser.

Screenshot Capture

Capture a styled preview card as an image with html2canvas.

SVG Editor

Build simple SVG graphics with shapes, labels, and export-ready markup.

Aspect Ratio Layout Calculator

Calculate reduced ratios, responsive CSS, and padding tricks from any frame size.

Border Radius Generator

Generate CSS border-radius values for custom shapes.

Box Shadow Generator

Create CSS box shadows with a visual editor.

CSS Filter Generator

Adjust blur, brightness, contrast, hue, and more with live CSS output.

CSS Gradient Generator

Create linear and radial gradients with multiple stops.

CSS Grid Template Generator

Build responsive CSS Grid layouts visually with named areas, repeat helpers, and breakpoint previews. Designers and frontend teams can test layouts quickly before writing production CSS.

Keyframes Animator

Generate CSS `@keyframes` animations with timing controls and preview.

Spacing Scale Generator

Generate modular spacing scales for UI systems from a base size and ratio.

SVG Path Editor

Compose simple SVG paths and inspect their generated path commands.

SVG Sprite Sheet Generator

Combine multiple SVG icons into one optimized sprite sheet with symbol IDs, previews, and usage snippets. It makes icon systems easier to manage while keeping assets private and local.

Text Shadow Generator

Generate CSS text-shadow values with a live headline preview.

Transform Generator

Create translate, scale, rotate, and skew transform snippets visually.

Broken Link Checker

Check a list of URLs in the browser and mark timeout or fetch failures clearly.

Canonical Tag Generator

Create canonical link tags for pages, product variants, and paginated URLs.

DNS Lookup

Look up DNS records for any domain with resilient browser-safe handling.

Hreflang Tag Generator

Generate hreflang link tags for multilingual and multi-region sites.

Internal Link Graph Visualizer

Turn pasted URL and link-export data into a visual internal-link graph to spot orphaned pages, weak clusters, and overlinked nodes. It helps SEO teams plan site structure without sending crawl exports to an outside tool.

IP Address Lookup

Find your IP address and location information with client-side fallbacks.

Keyword Density Checker

Analyze repeated phrases and top keywords inside any text block.

Meta Description Length Checker

Review multiple meta descriptions for length and snippet-friendly ranges.

Meta Tags Generator

Generate SEO-friendly meta tags including Open Graph output.

Open Graph Preview Tool

Preview how Open Graph titles, descriptions, and images could appear socially.

Page Speed Insights Simulator

Estimate performance bottlenecks from page metrics with helpful guidance.

QR Code Reader

Read and decode QR codes from uploaded images.

Readability Score Calculator

Estimate Flesch-style readability and sentence complexity from text.

Redirect Chain Mapper

Visualize redirect chains from pasted crawl exports, response logs, or manually entered hops so teams can trim unnecessary redirects. This is useful during migrations, replatforms, and large-scale URL cleanup projects.

Robots.txt Generator

Create robots.txt files for your website.

Schema Markup Builder & Validator

Generate valid JSON-LD for articles, organizations, products, FAQs, and local businesses with instant preview and rule checks. It helps SEO teams ship structured data faster without copy-pasting uncertain snippets.

SEO Meta Tag Extractor

Inspect a pasted HTML document for title, description, canonical, and social tags.

SERP Snippet Preview

Preview title tags, URLs, and meta descriptions in a search-style snippet layout.

Sitemap Generator

Generate XML sitemaps from a list of URLs.

Sitemap Priority Planner

Assign sitemap priorities and change frequencies from a simple URL inventory.

Slug Optimizer

Turn page titles into clean, readable, SEO-friendly URL slugs.

SSL Checker

Check SSL certificate status for any domain with graceful fallbacks.

Twitter Card Validator

Validate key Twitter Card fields and preview card-style output locally.

User Agent Parser

Parse browser, operating system, and device details from user agent strings.

UTM Campaign Builder & Validator

Create consistent UTM URLs, validate naming conventions, and catch messy campaign tagging before links go live. It helps marketing teams keep analytics cleaner across channels and stakeholders.

UUID Generator

Generate UUIDs in bulk with instant copy and export support.

Website Color Palette Extractor

Extract a rough palette from pasted CSS or HTML color values.

Age Calculator

Calculate age precisely from a birth date with years, months, and days.

BMI Calculator

Calculate body mass index from weight and height.

Compound Interest Calculator

Estimate future value and earned interest with annual compound growth.

Currency Converter

Convert currencies with browser fetch plus resilient offline fallback rates.

Date Difference Calculator

Measure the exact duration between two dates and times.

Discount Calculator

Work out discount savings and final totals after percentage reductions.

Electricity Cost Calculator

Estimate monthly electricity cost from wattage, daily runtime, and energy price.

Fuel Cost Calculator

Estimate fuel needed and trip cost from distance, efficiency, and fuel price.

GPA Calculator

Estimate GPA from course grades and credit hours.

Loan Calculator

Estimate EMI payments, interest cost, and repayment totals.

Margin Calculator

Estimate gross margin percentage and profit from selling price and cost.

Markup Calculator

Calculate selling price and profit from cost and markup percentage.

Pace Calculator

Calculate pace per kilometer and average speed from distance and total time.

Percentage Calculator

Solve common percentage calculations instantly.

Percentage Change Calculator

Measure percentage increase or decrease between an original and a new value.

Roman Numeral Converter

Convert numbers to Roman numerals and Roman numerals back to numbers.

Speed Distance Time Calculator

Calculate distance traveled from speed and travel time in hours and minutes.

Time Zone Converter

Convert a date and time across common time zones.

Tip Calculator

Calculate tip amount, total bill, and per-person split in one step.

Unit Converter

Convert between common units for length, weight, speed, and temperature.

Coin Flip Simulator

Flip a virtual coin repeatedly and track heads-versus-tails results.

Pronounceable Password Generator

Generate strong password phrases built from pronounceable chunks.

Random Address Generator

Create plausible sample street addresses for demos and testing.

Random Avatar Generator

Create simple SVG identicon-style avatars from a seed.

Random Color Generator

Generate random HEX and RGB colors with instant swatches.

Random Credit Card Generator

Generate Luhn-valid test card numbers for sandbox environments.

Random Emoji Generator

Generate emoji mixes for reactions, bios, and fun prompts.

Random Name Generator

Generate first and last name combinations for mock data.

Random Number Generator

Generate integers or decimals within a custom range.

Random Phone Number Generator

Generate formatted sample phone numbers for test data use.

Random Quote Generator

Pull inspirational and practical quote snippets from a local set.

Audio Recorder

Record microphone input and download the captured audio.

Audio Waveform Visualizer

Load an audio file and inspect its waveform in the browser.

Beat Interval Calculator

Convert BPM into beat, bar, and loop timing intervals in milliseconds.

BPM Tap Tempo & Delay Time Calculator

Tap a tempo or enter BPM to calculate note divisions, delay times, and loop-friendly timing values. It helps producers and musicians line up effects and timing without a DAW plugin.

Frequency to Note Converter

Convert audio frequencies to the nearest musical note and cents offset.

Metronome

Practice with a browser-based metronome and adjustable tempo.

Tone Generator

Generate sine, square, triangle, and sawtooth tones in the browser.

White Noise Generator

Generate looping white, pink-style, or brown-ish noise textures locally.

Base64 File Encoder

Encode uploaded files to Base64 strings in the browser without server uploads.

Checksum Calculator

Calculate CRC32, simulated MD5, and SHA-256 hashes for uploaded files.

File Merger

Merge multiple text files into one combined output with separators.

File Splitter

Split text files by line count or approximate chunk size.

Filename Sanitizer

Normalize messy file names for safer downloads, uploads, and archives.

Line Ending Converter

Convert text between LF and CRLF line endings for editor and repo consistency.

MIME Type Detector

Inspect uploaded files for MIME type, extension, and signature hints.

PDF Metadata Privacy Checker

Inspect PDF author, title, subject, timestamps, and hidden metadata before sharing files. It helps teams remove accidental identifiers from proposals, resumes, and reports without sending documents to a server.

ZIP File Compressor

Bundle multiple files into a downloadable ZIP archive locally.

Accessibility Focus Order Visualizer

Map keyboard tab order, skip-link flow, and focus traps from pasted HTML so teams can catch navigation issues before shipping. The visual overlay makes a11y reviews faster for product, QA, and frontend teams.

Alt Text Length Checker

Review image alt text for length, clarity, duplication, and decorative-image handling. It helps content teams write accessible image descriptions without relying on AI or third-party APIs.

ARIA Label Reviewer

Review interactive elements for missing accessible names and weak ARIA labeling.

Color Contrast Checker

Check foreground and background color contrast against common WCAG thresholds.

Focusable Elements Checker

List focusable controls, tabindex order, and skip-link coverage from pasted markup.

Heading Structure Outline

Audit pasted HTML for heading order, skipped levels, and document outline clarity.

CSV Column Profiler

Profile CSV headers, fill rates, and likely column types from pasted data.

Data Size Estimator

Estimate dataset storage growth from row counts and average row sizes.

Generate Chart

Turn pasted CSV, JSON, or plain text into configurable charts and downloadable reports.

HAR File Viewer & API Timeline Analyzer

Open HAR exports locally and turn them into a sortable timeline for slow requests, waterfalls, headers, and payload sizes. It helps engineering and QA teams diagnose frontend performance without uploading logs.

Ping Test Tool

Test round-trip request latency to a public URL with browser-safe fetch timing and packet-loss estimates.

WiFi Speed Test

Measure same-origin download speed, upload speed, latency, and connection quality with browser-safe benchmarks.

Break-Even Calculator

Calculate break-even units, target revenue, and contribution margin with interactive charts and scenario sliders. It gives founders, operators, and consultants a fast way to test pricing and cost assumptions privately.

Invoice Due Date & Late Fee Calculator

Calculate due dates, grace periods, and simple late-fee scenarios for invoices across common billing terms. It helps freelancers and small businesses stay organized without relying on online accounting portals.

Pricing Markup Calculator

Turn unit cost and target markup into a selling price and gross margin estimate.

Profit Margin Calculator

Calculate profit, markup, and margin from revenue and cost inputs instantly.

SaaS Pricing Margin Calculator

Model SaaS pricing tiers, gross margin, payback period, and annual recurring revenue from your own assumptions. It helps operators and growth teams reason about pricing without handing numbers to external calculators.

Sales Tax Calculator

Calculate tax-inclusive totals and tax amounts from any subtotal and rate.

Subscription Revenue Forecast

Project customer growth, churn, MRR, and ARR from recurring revenue assumptions.

Capacitor Charge Discharge Calculator

Estimate RC time constants and common charge thresholds for timing circuits.

LED Series Resistor Calculator

Calculate a safe resistor value and power rating for single-LED circuits.

Ohm’s Law & Power Triangle Calculator

Calculate voltage, current, resistance, power, and related electrical values with unit switching and visual formulas. It is ideal for students, technicians, and makers who need quick checks with clear explanations.

Power Supply Runtime Calculator

Estimate battery runtime from capacity and expected load current.

Resistor Color Code Calculator

Decode resistor bands visually, calculate tolerance, and switch between 4-band, 5-band, and 6-band modes. It helps electronics learners and hobbyists avoid common reading mistakes.

Voltage Divider Calculator

Calculate divided output voltage and resistor ratios for simple analog circuits.

Flashcard Randomizer

Shuffle flashcard prompts from a custom list for quick exam practice.

Fraction Simplifier Calculator

Reduce fractions to lowest terms and convert them to decimals and percentages.

Scientific Notation Converter

Convert numbers between expanded form and scientific notation instantly.

Study Session Planner

Build focused study blocks with short breaks and long-break intervals.

Unit Circle Visualizer

Explore angles, radians, coordinates, sine, cosine, and tangent with an interactive unit circle and labeled quadrants. It turns a memorization-heavy topic into a visual learning experience.

Escape Velocity Calculator

Calculate escape velocity from planetary mass and radius estimates.

Moon Phase Finder

Estimate the moon phase and illumination for any calendar date.

Planet Weight Calculator

Compare your Earth weight against gravity on planets and the moon.

Telescope Field of View Calculator

Estimate telescope magnification, true field of view, and exit pupil using aperture, focal length, and eyepiece data. It helps astronomy hobbyists compare setups before a night of observing.

Telescope Magnification Comparator

Compare eyepiece magnification and field-of-view tradeoffs for one telescope setup.