Free Online Tools

Detect the BPM of any audio file instantly in your browser. Upload MP3, WAV, FLAC, or M4A and get an accurate tempo reading with confidence score. No uploads.

Audio Tools

Tempo Tapper

Tap the button or press Space in time with any song to instantly calculate BPM. Shows rolling average, interval history, half-time, double-time, and tempo feel.

Audio Tools

LUFS Meter

Measure integrated loudness, momentary peak, short-term peak, true peak (dBTP), and loudness range (LRA) of any audio file using ITU-R BS.1770-4. Compare against streaming platform targets.

Cipher

ROT13 Decoder & Encoder

Instantly decode or encode any text with ROT13 — the self-inverse cipher used for Reddit spoilers, Usenet posts, and puzzle hints. No sign-up. Works in your browser.

Cipher

Caesar Cipher Decoder & Encoder

Decode or encode any Caesar cipher with a shift slider (1–25) and instant brute-force mode that shows all 25 shifts ranked by English likelihood.

Encoder

SAML Encoder and Decoder

Encode XML to SAMLRequest or SAMLResponse format, or decode either parameter back to readable XML. Handles deflate and Base64 automatically.

Decoder

ASCII Decoder and Encoder

Decode ASCII codes (decimal, hex, binary, octal) to readable text, or encode text back to ASCII codes. Includes a clickable ASCII reference table.

Encoder

Base64 Encoder and Decoder

Encode text to Base64 or decode Base64 back to readable text. Supports standard and URL-safe Base64, full UTF-8 including emoji.

Generator

Gradient Palette Generator

Generate beautiful 4-color gradient palettes and export CSS. Pick color stops, choose linear/radial/conic type, preview swatches, and copy the gradient CSS in one click.

Generator

Gradient Maker from Image

Upload any photo and extract its dominant colors into a CSS gradient. Uses k-means clustering on pixel data to generate a smooth gradient and palette you can copy in one click.

Generators

Hackathon Team Name Generator

Generate creative hackathon team names instantly. Choose from tech, space, nature, mythology, animal, and pun themes.

Text Tools

Bubble Text Generator

Convert any text into bubble letters — circled outline, black filled, keycap, squared, fullwidth, and double struck. Copy for Instagram, Twitter, Discord, and TikTok.

Text Tools

AI Slop Checker

Detect whether text or images were generated by AI. Get a confidence score, detected patterns, readability scores, and strip hidden AI fingerprints from any content.

Text Tools

AI Paragraph Expander

Expand any paragraph into a longer, richer version. Choose your tone, expansion style, and target length (2×, 3×, or 4×). Free AI writing tool.

Image Tools

AI Uncrop Image

Expand any photo beyond its original borders using AI outpainting. Choose how much to extend each edge, add an optional prompt, and download the seamlessly extended result.

PDF Tools

PDF to Grayscale Converter

Convert any PDF to grayscale online for free. All pages converted using the luminosity formula and bundled into a downloadable grayscale PDF. Runs entirely in your browser — no upload.

Math Tools

Discriminant Formula Calculator

Calculate the discriminant (b² − 4ac) of any quadratic equation. Enter a, b, c to get the discriminant value, nature of roots, step-by-step working, and exact or decimal roots.

Science Tools

Structural Formula Calculator

Visualize 2D structural formulas of any molecule. Choose from 40+ molecules or enter SMILES notation. Shows bonds, functional groups, molecular weight, and atom counts.

Writing Tools

Run On Sentence Checker

Instantly detect comma splices and run-on sentences in your text. Get clear explanations and numbered fix suggestions for every issue.

Writing Tools

Virality Checker

Score your content's viral potential across hook strength, emotional power, shareability, trending potential, and engagement. Free instant analysis.