Free Online Web Tools for Everyone

Convert CSV to JSON and JSON to CSV both ways. 100% in your browser, no uploads.

Format and beautify SQL: MySQL, PostgreSQL, SQLite, SQL Server, BigQuery. 100% in your browser.

Minify HTML, CSS and JavaScript removing comments and whitespace. 100% in your browser.

Decode x.509 SSL/TLS certificates (PEM): issuer, validity, SAN, SHA-256 fingerprint. 100% in your browser.

Hide and reveal secret messages inside an image (LSB). 100% in your browser, PNG download.

Format, validate and minify JSON. Errors with exact line, tree view, sort keys. No sign-up.

Encode and decode Base64 instantly. Full Unicode support, URL-safe mode. No sign-up.

Encode and decode URLs with encodeURIComponent or encodeURI. Percent-encoding instantly. No sign-up.

Generate MD5, SHA-1, SHA-256 and SHA-512 hashes in real time. Integrity verification. No sign-up.

Convert Unix timestamps to readable dates. Live current timestamp. ISO 8601, UTC, relative. No sign-up.

Generate unique UUID v4 with crypto.randomUUID(). Bulk generation, history, copy. No sign-up.

Convert between binary, octal, decimal and hex in real time. All fields update simultaneously.

Decode JWT instantly. Header, payload, standard claims and expiry verification. No sign-up.

Complete reference for 60+ HTTP 1xx-5xx status codes with bilingual descriptions and real-time search.

Encrypt text and files with AES-256-GCM and PBKDF2. 100% in browser. Data never leaves your device.

Test regular expressions in real time. Match highlighting, capture groups and quick pattern reference.

Build cron expressions visually. Natural language description and next 5 executions calculated.

Clean and compress SVGs. Removes Inkscape metadata, empty groups and editor code. No external dependencies.

Analyze HTTP headers of any URL. Status code, response time and security headers analysis: HSTS, CSP, X-Frame-Options.

Discover your public IP or look up any IP. Country, city, ISP, timezone and coordinates in real time.

Full technical audit: DNS, WHOIS, SSL, SEO, email, redirects and stack. Score 0-100.

Query DNS records: A, AAAA, MX, TXT, NS, CNAME, SOA. Real time via Cloudflare.

Domain registration info: registrar, dates, nameservers. RDAP data.

Verify SSL/TLS certificates: issuer, expiry, SANs, protocol and grade A+→F.

Trace URL redirect chain. HTTP code, URL and time per hop. Up to 10 hops.

Discover subdomains via Certificate Transparency (crt.sh). Passive, no active scanning.

Verify SPF, DKIM and DMARC. Protected/partial/unprotected verdict against spoofing.

Detect framework, CMS, CDN, server and analytics. Next.js, WordPress, Cloudflare and more.

On-page SEO audit: 19 checks, score 0-100, quick wins. Title, meta, H1, OG, schema.

Convert your code's indentation between tabs and spaces, configurable width.

Combine technologies and editors to generate your .gitignore instantly.

Generate your project's LICENSE file: MIT, Apache 2.0, GPL 3.0, BSD, ISC.

Convert Linux permissions between octal (755, 644) and symbolic (rwxr-xr-x) with visual checkboxes.

Encode and decode in Base64, Base32, Base58, Base85, Hex, URL or HTML in a single tool.

Generate your robots.txt with per-bot rules, sitemap and AI crawler blocking (GPTBot, ClaudeBot...).

Optimized Dockerfiles for Node, Next.js, Python, Go and Rust with multi-stage and non-root user.

Build your local stack visually: PostgreSQL, MySQL, Redis, MongoDB, Nginx and your app in YAML.

Server blocks for static, SPA or reverse proxy with SSL, gzip, cache and security headers.

Ready-to-go CI/CD workflows: Node CI, Vercel deploy or Docker image to GHCR with cache.

Ed25519/RSA pairs in OpenSSH format generated with Web Crypto. The private key never leaves your device.

Find out how identifiable your browser is: canvas, WebGL, fonts and audio. Local analysis.

2FA codes from your secret or otpauth:// URI, RFC 6238 verified. No servers.

AES-128 round by round: SubBytes, ShiftRows, MixColumns and key schedule, validated with FIPS-197.

Converts JSON to YAML and TOML with a round-trip verified emitter.

Ready systemd unit files: auto-restart, safe user and boot startup.

Detects homoglyph spoofed domains and decodes xn-- (RFC 3492 verified).

Visual ~/.ssh/config: aliases, per-host keys and ProxyJump hops without long commands.

Generate RSA keys and encrypt a message step by step: φ(n), extended Euclid and binary exponentiation, verified against OpenSSL.

CSV to INSERT statements for MySQL, PostgreSQL, SQLite, SQL Server or ANSI, with an RFC 4180 parser and inferred CREATE TABLE.

CSV to aligned ASCII tables: Unicode boxes, plain ASCII or GitHub-ready Markdown, with automatic widths.

Analyze a suspicious link before clicking: typosquatting, homoglyphs, punycode, risky TLDs and subdomain tricks.

Stack several CSVs with unified headers or join them by column with INNER, LEFT, RIGHT and FULL JOIN.

Convert an image to Base64 or a data URI and decode Base64 back to an image. With size, overhead and format detection.

Code point, UTF-8, UTF-16, HTML entity, JavaScript and CSS escape and URL encoding of each character.

Generate harmonic palettes: complementary, analogous, triadic and shades. Copy any HEX.

Convert px, rem, em, vw, vh, pt in real time. Configurable base font-size and viewport.

Create linear, radial and conic CSS gradients. Real-time preview, presets and CSS code ready to copy.

Create CSS shadows with multiple layers. Offset, blur, spread, color, opacity and inset per layer. Live preview.

Frosted-glass effect with adjustable blur and transparency, live preview and ready-to-paste CSS.

Soft UI styles with dual shadow (raised/pressed), adjustable light angle and intensity.

Crop elements with preset shapes or draggable vertices: polygon, circle and ellipse.

Animated spinners in pure CSS: rings, dots, bars, pulse and ripple. No JavaScript or GIFs.

Per-corner rounded shapes or organic blobs with the 8-value syntax.

Triangles and arrows with the border trick: 8 directions, size and color.

Animated pure-CSS switches with accessible checkbox. No JavaScript.

Styled scrollbars for Chrome, Safari and Firefox with a live preview.

Convert PNG, JPG, WebP, AVIF, BMP and ICO. Generate favicons with multiple resolutions. No sign-up.

Filters, adjustments, crop and rotation. B&W, Sepia, Vintage and more. No sign-up.

Remove the background from any photo with AI, 100% in your browser. No uploads, no watermark. Transparent, color or image background.

Compress JPG, PNG and WebP in batch with quality control. Download as ZIP. 100% in your browser.

Resize images in batch by percentage or max dimension. Download as ZIP. 100% in your browser.

Trim, compress, convert and edit videos. Rotate, GIF, watermark, subtitles. No sign-up.

Analyze, remove and edit EXIF, GPS, IPTC and XMP metadata. Lossless for JPEG. Privacy risk indicator. No sign-up.

Create favicons from image or text/emoji. 8 sizes (16px to 512px), Apple Touch Icon, PWA and HTML snippet. No sign-up.

Create clickable zones on images. Rect, circle and poly. Undo/redo, snap to grid, zoom. Export HTML or JSON.

Upscale photos ×2/×4 with Swin2SR on your GPU. Before/after slider, no uploads.

Extract the dominant colors from any image with k-means, in your browser. HEX, RGB, HSL and CSS export.

LQIP BlurHash placeholder from any image, with decoded preview and HTML, CSS and React snippets.

Find duplicate photos with pHash, aHash and dHash by dropping whole folders. 100% local.

Compare two images with a before/after slider and generate the HTML code with embedded images.

Simulate protanopia, deuteranopia, tritanopia and achromatopsia on a color or an image. With ΔE distance.

Trim MP3, WAV, OGG, FLAC or M4A by exact seconds. Fast mode with no re-encode. 100% in your browser.

Convert between MP3, WAV, OGG, FLAC, M4A and Opus with bitrate control. 100% in your browser.

Listen to any text with your system's voices. Adjustable rate, pitch and volume. No server.

Transcribe any audio to text with AI (Whisper), 100% in your browser. No minute limits.

Adjust volume to the podcast, music or broadcast (EBU R128) LUFS standard. 100% in your browser.

Combine several audio files into one, in the order you choose. Mix different formats. 100% in your browser.

Add a fade in and fade out to your audio, with adjustable duration. 100% in your browser.

Automatically remove silence from an audio file, with adjustable threshold and duration. 100% in your browser.

Generate pure tones at any frequency and waveform, listen or download as WAV.

Metronome from 30 to 300 BPM, adjustable time signatures and tap tempo. 100% in your browser.

Visualize the frequencies or waveform of an audio file or your microphone in real time.

Record with your microphone, pause and resume, download instantly. 100% in your browser.

Turn any song into a short ringtone with a smooth fade. 100% in your browser.

Censor words or sections of an audio with a beep, with exact control over start and end.

Change speed while keeping pitch, or pitch while keeping speed, from 0.25x to 4x.

Generate 8-bit sound effects (coin, jump, laser, explosion...) with random variations.

Tune your guitar with your microphone and real-time note and cents detection.

Reduce constant background noise from a recording with a spectral denoiser. 100% in your browser.

Edit title, artist, album, year, genre and cover art of your MP3s. 100% in your browser.

Split a song into vocals, drums, bass and other instruments with AI (HTDemucs). 100% in your browser.

Test L/R channels, phase and a 20 Hz to 20 kHz sweep.

Switch between two audio tracks instantly with crossfade and RMS-matched levels.

Find a song's BPM by tapping the beat, with statistical median and spread.

Scan documents with your camera, fix the perspective, apply filters and export to PDF. Multi-page and OCR. 100% in your browser.

Rotate PDF pages 90, 180 or 270 degrees. 100% in your browser, no watermark.

Change the order of PDF pages. 100% in your browser, no watermark.

Extract all the text from a PDF and download it as .txt. 100% in your browser.

Add page numbers to a PDF, configurable position and start number. 100% in your browser.

Hub of 6 PDF tools: images to PDF, merge, split, PDF to images, compress and watermark.

Convert JPG, PNG, WebP and more to PDF. Drag & drop to reorder, A4/Letter size, margins. No sign-up.

Merge multiple PDFs into one. Reorder with drag & drop. No sign-up, 100% in browser.

Split a PDF by page range, every N pages or page by page. No sign-up.

Convert each PDF page to JPG or PNG. 1x, 2x or 3x resolution. No sign-up.

Reduce PDF size by removing metadata and optimizing structure. No quality loss.

Add text watermark to all PDF pages. Configurable position, opacity and color.

Visually select pages to delete from a PDF and download the result. No sign-up.

Invoices with Spanish legal fields, VAT, IRPF, validated NIF and total in words.

Quotes with PRE numbering, validity with expiry, per-item VAT and total in words.

Delivery notes with ALB numbering, validated NIF and receipt signatures.

Count words, characters, sentences and paragraphs in real time. Reading time and keyword density.

Create Markdown tables visually and copy the code. For GitHub, Notion, Obsidian.

Markdown editor with preview. Convert to Word (.docx) or import a .docx to Markdown. No sign-up.

Convert text to camelCase, snake_case, kebab-case, PascalCase, UPPERCASE and more. Real time.

Compare two texts and highlight line-by-line differences. Green added, red removed. Download the diff.

Generate placeholder text in paragraphs, sentences, words or lists. Classic Latin, Spanish or English. No sign-up.

Convert text to URL slug in real time. Remove accents, choose separator and preview the URL. No sign-up.

Remove accents from any text instantly, keeping the ñ if you want.

Sort, deduplicate, reverse or shuffle any list of lines instantly.

Text to Morse and Morse to text with the full ITU table, audio with adjustable WPM and tone, and WAV download.

Convert subtitles SRT to VTT and back, with time shifting and overlap warnings.

Practice CMD and PowerShell in a simulated terminal with guided lessons and self-checks.

Practice bash with pipes, grep, chmod and remote SSH in a simulated terminal with guided lessons.

Generate QR for URLs, text and contacts. Add your logo. Download as PNG. No sign-up.

Generate secure passwords and passphrases. Real entropy, no servers, no history.

Convert between HEX, RGB, HSL and HSV. Palettes, related colours and WCAG contrast.

Scientific, programmer and financial. Binary/hex/octal, bitwise ops, mortgages and compound interest.

Calculate width and height keeping the ratio (16:9, 4:3, 21:9…). Simplified ratio.

Convert length, weight, temperature, area, volume, speed, digital storage, time and pressure. Over 80 units.

Pomodoro timer with browser notifications, sound, session statistics and customizable durations.

Generate secure, memorable passphrases by combining random words with crypto.getRandomValues.

Measure a password's real strength in bits, detect common patterns. Never leaves the browser.

Calculate the SHA hash of any file and compare it with a known one to verify its integrity.

Pick a random winner with real cryptographic randomness, give out several prizes without repeats.

Analyze passwords with zxcvbn (Dropbox): score, crack time and concrete warnings. 100% local.

Password-protect files and folders in an AES-256 ZIP, and open protected ZIPs in your browser. 100% local.

Record screen, window or tab in 4K/1080p with system audio and mic — no watermark, no install.

Test camera and mic: live preview, real resolutions, level meter and L/R speaker test.

Grab any screen pixel with the native picker: HEX, RGB, HSL, WCAG contrast and an exportable palette.

Test every key with a visual map and measure anti-ghosting with simultaneous presses. 100% local.

Find dead pixels, stuck pixels and backlight bleed with a fullscreen color sweep.

Random wheel for raffles and decisions with a cryptographically uniform winner, history and remove-winner mode.

Check whether your browser reveals your real IP via WebRTC even with a VPN, with a copyable report.

Measure your click speed (CPS), double click and check mouse buttons and wheel.

RPG dice with NdS notation and unbiased cryptographic randomness.

Coin flipper with cryptographic randomness and best-of-N series.

Split names into random balanced teams with cryptographic shuffling.

Measure your words per minute with a timer, built-in texts and a comprehension quiz.

Scannable EAN-13 and Code 128 barcodes with SVG and PNG download.

Tabata and HIIT with rounds, sets, countdown and phase-change beeps.

RFC 5545 .ics events with reminders, recurrence and Google or Outlook links.

Share your WiFi with a standard QR that connects on scan, no password typing.

Exact age in years, months and days, date difference and business days with Spanish holidays.

Check Spanish DNI, NIE and CIF and compute the check letter or digit with the official algorithm.

Validate IBAN with the mod 97 algorithm, identify the country, format the number and compute the check digits.

Convert the time between any pair of IANA time zones, with daylight saving and the hour difference.

Windows system cleaner. Temp files, browser cache, Prefetch and Recycle Bin. 100% offline, open source.