# 73hi Online Tools > 73hi is a free English-language collection of browser-based utilities for developers and everyday users, organised into eight categories: image, video, AI, text, crypto, network, practical and file operations. Use the pages below as the canonical descriptions of the tools available on 73hi. The interactive utilities run in a web browser, and the site does not require an account. The home page introduces every category and highlights the latest additions: the AI Background Remover and the AI Image Generator, two neural-network tools that run entirely in the browser. ## Image Tools - [Image Color Picker](https://73hi.com/image.html): Pick exact pixel colours from any picture in four colour formats, with the image palette read locally in the browser. - [Image to WebP Converter](https://73hi.com/image-to-webp.html): Convert pictures to WebP in the browser and compare quality and file size before saving. - [Image to ICO Converter](https://73hi.com/image-to-ico.html): Turn PNG and JPG pictures into Windows favicon.ico files. ## Video Tools - [Video Tools](https://73hi.com/video.html): Category page for the video tools listed below. - [Extract Video Frames and Make a GIF](https://73hi.com/extract-video-frames-and-make-gif-online-free.html): Load a video, browse it as a filmstrip, save any frame as a PNG or JPEG still, or pick a range and export an animated GIF. FFmpeg compiled to WebAssembly does the work in the browser. - [Add Transitions to a Video](https://73hi.com/add-transitions-to-video-online-free.html): Place a cut point on the timeline of a video and blend the two halves with any effect from the FFmpeg xfade catalogue, then export a new MP4. Runs locally in WebAssembly. - [Make a Video from Photos with Transitions](https://73hi.com/make-video-from-photos-with-transitions-online-free.html): Turn a set of pictures into one MP4: drag them into order, set a duration per photo, choose a transition for every join and add background music. Runs locally in WebAssembly. ## AI Tools - [AI Tools](https://73hi.com/ai.html): Category page for the AI tools listed below. - [AI Background Remover](https://73hi.com/remove-image-background-ai-online-free.html): Remove the background from a photo with a choice of four neural networks (U2Netp, Silueta, MODNet, BiRefNet-lite) that run on WebAssembly in the browser, then download a transparent PNG with nothing uploaded. - [AI Image Generator](https://73hi.com/generate-images-with-ai-online-free.html): Generate a picture from a text prompt with Z-Image-Turbo, whose INT4 ONNX weights are fetched from Hugging Face and cached in the browser, so the model never touches the 73hi server. - [AI Text to Speech](https://73hi.com/text-to-speech-ai-online-free.html): Turn text into speech locally with MOSS-TTS-Nano, a 0.1B multilingual model whose ONNX graphs run on WebAssembly in the browser, with built-in voices and optional voice cloning. - [Image Text Extractor](https://73hi.com/extract-text-from-image-online-free.html): Read printed and handwritten text out of any picture with PP-OCRv6, a compact OCR model whose ONNX graphs run on ONNX Runtime Web in the browser; the model is fetched from Hugging Face (or ModelScope on 73hi.net) and nothing is uploaded. ## Text Tools - [Text Tools](https://73hi.com/text-tools.html): Category page for the two text tools listed below. - [Text Comparator](https://73hi.com/text-tools.html): Compare two texts or large files in the browser and highlight every difference. - [JSON Validator and Formatter](https://73hi.com/json.html): Validate, format, minify, escape, and unescape JSON. ## Crypto Tools - [Crypto Tools](https://73hi.com/encrypt.html): Category page for the four crypto tools listed below. - [Encrypt and Decrypt Text](https://73hi.com/encrypt-and-decrypt-text-online-free.html): Encrypt and decrypt text with AES, DES, 3DES, RC4, Rabbit or TripleDES using a secret key that never leaves the browser. - [Generate RSA Key Pair](https://73hi.com/generate-rsa-key-pair-online-free.html): Generate an RSA public and private key, export both as PEM, import existing keys, and encrypt or decrypt text locally. - [Base64, URL and Unicode Encoder](https://73hi.com/base64-url-unicode-encode-decode-online-free.html): Encode and decode Base64, percent-encoded URLs and Unicode escape sequences in the browser. - [Hash and HMAC Generator](https://73hi.com/generate-hash-md5-sha256-online-free.html): Calculate MD5, SHA-1, SHA-256 and SHA-512 digests, or compute a keyed HMAC with your own secret. ## Network Tools - [Network Tools](https://73hi.com/network.html): Category page for the four network tools listed below. - [IP Address Lookup](https://73hi.com/ip-address-lookup-online-free.html): Look up an IPv4 address, an IPv6 address or a domain and see its location, organization, ASN, time zone and currency, or check your own public IP. - [cURL Command Builder](https://73hi.com/generate-curl-command-online-free.html): Build a cURL command from a form with headers, body and proxy, then export it as Python, JavaScript, Java, Go, Rust or C# code. - [Common Network Ports](https://73hi.com/common-network-ports-list-online-free.html): Search 45 common port numbers by number, service name or description, from SSH and HTTPS to MySQL, Redis and Kafka. - [Unix Timestamp Converter](https://73hi.com/unix-timestamp-converter-online-free.html): Convert Unix timestamps in seconds or milliseconds to readable dates and build timestamps from a picked date and time, entirely in the browser. ## Practical Tools - [Practical Tools](https://73hi.com/practical-tools.html): Category page for the practical tools listed below. - [Chinese Zodiac Lookup](https://73hi.com/chinese-zodiac-by-birth-date-online-free.html): Enter a birth date and see the Chinese zodiac animal, or shengxiao, calculated from the lunar calendar. - [Rock Paper Scissors](https://73hi.com/random-tools-online-free.html): A two-player rock-paper-scissors match on one device with configurable rounds, a per-round results panel and gestures drawn from the system's cryptographic entropy. - [Roll a Die](https://73hi.com/roll-a-die-online-free.html): A single animated die that tumbles with motion blur and settles on a true random face, never repeating the previous roll. - [Image Compressor](https://73hi.com/image-compress.html): Compress images to WebP, JPEG, AVIF, JPEG XL or PNG with a side-by-side before and after comparison, batch loading and local WebAssembly encoding. - [ImageSteg](https://73hi.com/image-steg.html): Hide a file or message inside an image with the steghide algorithm and reveal it again with a passphrase. ## File Operations - [File Tools](https://73hi.com/file.html): Category page for the file tools listed below. - [APK Viewer](https://73hi.com/apk-viewer.html): Select an APK and read its package name, version, signing scheme, certificate fingerprints, permissions, components, and a full file listing, all in the browser with nothing uploaded. - [Extract Resources from Files](https://73hi.com/extract-resources-from-file-online-free.html): Upload an EXE, MSI, APK or other installer and pull out the embedded images, videos and animations, entirely in the browser with nothing uploaded. ## About - [About 73hi](https://73hi.com/about.html): Read about the site's mission, technology, and contact information. - [Privacy Policy](https://73hi.com/privacy-policy.html): How the site collects, uses, and protects user information. - [Terms of Service](https://73hi.com/terms-of-service.html): The rules and guidelines for using the site's tools and services. ## Technical - [XML Sitemap](https://73hi.com/sitemap.xml): Canonical list of indexable pages. - [Robots Policy](https://73hi.com/robots.txt): Search crawler access policy.