Get work done in the browser No install. No waiting.

Open .md files in the browser. Side-by-side live preview with code highlight, image insert and dark mode. Drafts auto-save locally and never leave your device.

Generate heading slugs for TOC and anchors.

Generate a clickable Markdown table of contents from headings.

Extract links and image URLs from Markdown.

Live Mermaid editor for flowcharts, sequence, class, ER, gantt and more. Export SVG/PNG fully in-browser.

Convert CSV/TSV into Markdown tables quickly.

Check empty/duplicate headings, level jumps and bare URLs.

Count words, characters, paragraphs and reading time.

Edit HTML/CSS/JS with live preview.

Minify or pretty-print HTML locally.

Extract script tags, external sources and inline handlers.

Paste full HTML and preview.

Beautify or minify HTML in your browser.

Extract style tags, inline CSS, classes and stylesheets.

Strip HTML tags into plain, structured, or Markdown-ish text.

Convert common HTML structures into Markdown.

Compress videos locally with CRF and optional scale.

Linked preview for video, external audio and subtitles with offsets.

Trim ranges, mute audio, export MP4.

Cut a clip and export an animated GIF locally.

Remove audio track and keep the video.

Speed up or slow down video with optional pitch keep.

Rotate 90/180/270 or flip horizontally/vertically.

Convert media to MP4/WebM/MKV/MOV/AVI/TS/GIF and MP3/WAV/AAC/OGG/M4A/FLAC, with batch queue support.

Extract text from PDF pages, preserve page breaks, and create a Word-compatible DOC document.

Render scanned PDF pages and recognize Chinese or English text page by page, with a document download.

Read two DOCX or text files and find added, removed, and unchanged lines.

Compare two XLSX, XLS, or CSV files and list each changed cell with old and new values.

Recognize text and row structure in a table screenshot and create an editable XLSX workbook.

Extract important source sentences from PDF, DOCX, or pasted text and create reviewable bullets or a paragraph.

Group clauses by parties, payment, term, breach, termination, disputes, confidentiality, and other key topics.

Create new names with sequence, original name, date, prefix, suffix, and replacement rules, then download a ZIP.

Count characters, characters without spaces, CJK characters, words, lines, paragraphs, and reading time.

Convert between Simplified Chinese, Taiwan Traditional, Hong Kong Traditional, and Simplified output with phrase dictionaries.

Convert Chinese text into pinyin with tone marks, tone numbers, or no tones and configurable separators.

Convert text between upper, lower, title, sentence, camel, Pascal, snake, and kebab case.

Remove duplicate lines with controls for whitespace, letter case, empty lines, sorting, and reduction metrics.

Normalize Chinese or English punctuation, repeated marks, surrounding spaces, and common quote styles.

Check text against an editable term list, count matches, and mask, mark, or report the detected terms.

Use local extractive summarization and transparent rewrite rules to condense text or make it clearer and more formal.

Preview GLB/GLTF models with wireframe and auto-rotate.

Scale, rotate and translate a model, then export OBJ.

Inspect model size, meshes and bounding box.

Recompute smooth/flat normals for better lighting.

Generate simple 3D primitives and export OBJ.

Apply a solid material color with metalness and wireframe.

Turn a grayscale image into a simple terrain mesh.

Local preview for Wavefront OBJ meshes.

Enter a birth date and target date to calculate exact years, months, days, total months, weeks, days, and next birthday.

Calculate days, weeks, calendar months, hours, and minutes between two dates, including weekday and weekend counts.

Add or subtract business days with configurable weekend rules and a custom holiday list.

Compare equal-payment and equal-principal loans with monthly payment, total interest, and a full amortization schedule.

Estimate accumulated individual income tax, average monthly tax, and take-home pay under China resident comprehensive-income brackets.

Calculate BMI, basal metabolic rate, maintenance calories, and healthy weight range from body measurements and activity.

Convert accurately between length, mass, area, volume, temperature, speed, and digital storage units.

Calculate L/100km, km/L, US MPG, trip fuel cost, and cost per distance from mileage and fuel used.

Format JSON instantly with error hints. Beautify, minify and escape locally.

Test regex matches, capture groups and replace locally.

Compare two texts line by line with add/remove markers.

Encode and decode Base64 with Unicode support.

Parse URL query strings or build them from JSON.

Validate JSON syntax and optional Schema.

Convert between binary, octal, decimal and hexadecimal.

Encode and decode URL components or full URIs.

Compress JPG, PNG and WebP images toward 100 KB, 200 KB, 500 KB or a custom maximum size.

Create 1-inch, 2-inch, passport and square ID photos with background removal, color replacement and print sheets.

Recognize Chinese or English text in screenshots, photos and scans, then edit, copy or download the result.

Use local upscaling, denoise, contrast and sharpening to improve mildly blurred, noisy or low-resolution images.

Batch-fit product images to 800, 1000, 1200 or 1500 pixel square canvases with background, padding and shadow.

Compress images locally.

Crop images locally with free or preset aspects.

Convert PNG/JPEG/WEBP.

Edit and preview LaTeX formulas.

Build align / aligned / gather multi-line equations.

Build piecewise functions with cases / dcases.

Build frac / dfrac / continued fractions from a/b lines.

Common LaTeX formula templates.

Build bmatrix/pmatrix code from grid values.

Pick Greek letters, operators, arrows and set symbols.

Generate integrals, sums, products and limits.

Play Red against a lightweight computer opponent.

Chinese-style lightweight Go on 9/13/19 vs computer.

15×15 freestyle Gomoku vs computer with difficulty levels.

Play White against a lightweight computer opponent.

Race home as Red against computer players.

Play Red and hop against the computer.

Classic Othello rules against the computer.

Life-and-death Go problems.

Roll one or more dice locally.

Generate readable passphrases or strong random passwords.

Fair coin flips with streak stats.

Play against the computer and track win/draw/loss.

Yes/No ball or multi-option picker.

Edit a name list and spin a random winner.

Draw random palettes with HEX / RGB / HSL.

Shuffle a list into balanced teams.

Collect browser, device, network and capability info locally. Export JSON/Markdown with no upload.

Rewrite a rough prompt into clear role, task, constraints and output format.

Turn one idea into problem, MVP scope, milestones, risks and todos. Local Markdown export.

Turn messy notes into summary, decisions, action items and follow-ups.

Generate GA4 event maps, naming rules, gtag/GTM snippets and QA checklists by site type.

Structure a competitor into positioning, strengths, gaps, matrix and counter-moves.

Generate warm-up, core questions, wrap-up and facilitation tips for user interviews.

Structure deals with parties, pricing, escrow, checklist, message drafts and risk points.