Tools

Browser-based utilities and experiments.

41 tools

✦AIPromptLex (image prompt manager)Tokenizes image prompts and links shared words so you can explore them like a vocabulary index.View details

</>devUUID GeneratorGenerate UUIDs in the browser.

</>devURL Encoder and DecoderEncode and decode URL components, full URLs, and form values locally in your browser.

</>devBase64 Encoder and DecoderConvert UTF-8 text to and from Standard Base64 or Base64url locally in your browser.

</>devchmod SimulatorApply numeric or GNU symbolic modes and inspect permission-bit changes locally.

◷display20-20-20 Break TimerFree online 20-20-20 break timer that guides a 20-second distance break. Easy to use between meetings, study blocks, or coding sessions.

◉displayEye Training: SaccadeFree online saccade trainer that makes you reacquire a target as it jumps across the screen. Good for quick gaze shifts and scanning resets.

◌displayEye Training: Smooth PursuitFree online smooth pursuit trainer that lets you follow a moving target with your eyes only. Useful for breaking up long periods of fixed near-focus.

▭displayScreen Burn FixerFree browser tool that runs full-screen patterns to ease image retention on OLED and LCD displays.

⇄fileCross-Platform Filename Accident ScannerScan relative paths for Windows naming hazards, case collisions, and Unicode normalization collisions.

⇄fileFile Extension, MIME, and Signature Mismatch CheckerCompare the extension, declared MIME, and leading signature locally to find file format mismatches.

▤financeStock Vision (investment analysis reports)Investment analysis reports summarizing earnings and performance trends for Japanese and US stocks. Combines AI workflows with human review to deliver fact-based insights with links to primary sources.View details

◐imageChroma KeyFree online chroma key tool to remove background colors from images. Green screen and blue screen supported.

◇imagePixel CipherFree on-device tool that uses PBKDF2 + AES-GCM/CTR to encrypt images and stores decryption metadata in a PNG tEXt chunk for automatic recovery.

⇄imageImage ComparatorFree browser-based tool to compare two images, highlight pixel differences with tolerance control, and keep every file on your device.

▣imageInvert Color (Negative)Browser-based color inversion with a 0–100% blend slider. Keep the original format on download—no uploads required.

◐imageMonochrome ConverterFree online tool to convert images to monochrome (black and white) in your browser. Adjust contrast and brightness. No installation required.

▦imageNormal Map GeneratorGenerate normal maps from height maps or photos in the browser with intensity control and DirectX/OpenGL Y-flip.

▣imagePixelatorFree online tool to pixelate and mosaic images in your browser. No installation required.

✦imageImage ScrambleFree online tool to scramble images by dividing them into tiles and shuffling with a password. Perfect for privacy protection and temporary image concealment.

▦imageSeamless Texture MakerFree online tool to create seamless tileable textures from images in your browser.

▣imageStamp MakerFree online tool to convert images into stamp-style images like ink stamps or seals. Supports binary thresholding and dithering.

◇imagePNG Steganography (Hide Any File)Embed or extract any file in PNG metadata without altering pixels. 100% browser-side and lossless.

</>textInvisible Character and Bidi Control InspectorLocate zero-width characters, BOMs, non-breaking spaces, and bidirectional controls without uploading text.

⇄textUnicode Normalization Collision CheckerFind distinct identifiers that collide under Unicode normalization without uploading them.

•textCSV and JSON Table ConverterConvert between CSV and normalized Table JSON locally in your browser.

</>textLine Ending Accident ForensicsLocate mixed LF, CRLF, and CR endings and create deterministic LF and CRLF corrections.

•textTSV and JSON Table ConverterConvert between TSV and normalized Table JSON locally in your browser.

•textHTML Table and CSV ConverterConvert between HTML tables and CSV through normalized Table JSON in your browser.

•textHTML Table and TSV ConverterConvert between HTML tables and TSV through normalized Table JSON in your browser.

</>textHTML Table ↔ JSON ConverterConvert between an HTML table element and normalized Table JSON entirely in your browser.

</>textMarkdown Table ↔ JSON ConverterConvert between a GFM Markdown table and normalized Table JSON entirely in your browser.

</>textHTML Table ↔ Markdown Table ConverterConvert between HTML tables and GFM Markdown tables through Table JSON in your browser.

•textMarkdown Table ↔ CSV ConverterConvert between a GFM Markdown table and CSV locally in your browser.

•textMarkdown Table ↔ TSV ConverterConvert between a GFM Markdown table and TSV locally in your browser.

•textCSV ↔ TSV ConverterConvert between CSV and TSV locally in your browser.

◷utilityDST Ambiguous and Missing Time CheckerCheck whether a local time in an IANA time zone is unique, ambiguous, or nonexistent.

▦utilityPoster Tile Printing and Overlap CalculatorCalculate sheet count and tile ranges from poster size, paper, margins, and overlap.

▭videoVideo Sprite Sheet GeneratorFree online tool to generate sprite sheets from video files in your browser. No installation required.

•webCORS Preflight PredictorPredict whether a cross-origin request will trigger an OPTIONS preflight from its method and headers.

◷webCache-Control Freshness CalculatorCalculate HTTP response age and freshness using RFC 9111 rules without sending headers anywhere.