Image & Vector Studios
Image Studio
All-in-one browser image studio: batch JPEG/PNG/WebP compression, format conversion, aspect-ratio crop & resize, filters, watermarks, EXIF/GPS scrubbing, and .ico favicon packs.
FreeOpen tool
37 Local-First Web Utilities
Fast, Private Tools That Run in Your Browser
Format JSON and YAML, inspect JWTs, compress images, merge PDFs, check WCAG contrast, and run engineering calculations — locally on your device with no sign-up or server uploads.
- 100% Client-Side
- Zero Uploads
- No Account Needed
Browse by Category
11 focused categories covering 37 tools.
- GIS, Surveying & CAD Studios6 tools
- Image & Vector Studios3 tools
- Audio & Video Studios2 tools
- PDF & Archive Studios2 tools
- Data, SQL & Analytics Studios4 tools
- Developer & Code Studios5 tools
- Security & Crypto Studios3 tools
- Color & CSS Design Studios3 tools
- Text, Diff & Markdown Studios4 tools
- SEO, HTTP & Web Studios2 tools
- Finance & Engineering Studios3 tools
Featured Workspaces
Essential utilities across developer, security, media, PDF, and CSS workflows.
Audio & Video Studios
Audio & Waveform Studio
Decode and trim audio on an interactive waveform, apply fades and peak normalization, export 16-bit PCM WAV, inspect FFT spectrum & dBFS loudness, synthesize tones/noise, and run a precision metronome.
FreeOpen tool
PDF & Archive Studios
PDF Studio
Unified local PDF workspace: merge, split, reorder, delete, and rotate pages, stamp watermarks & page numbers, scrub metadata, render PDF ↔ PNG/JPG, and extract text to DOCX/Markdown.
FreeOpen tool
Data, SQL & Analytics Studios
JSON, YAML, XML & Config Studio
Validate, format, minify, sort keys, and convert across JSON, YAML 1.2, XML, and .env/INI configs, query deep paths, validate JSON Schema, and generate TypeScript/JSON-Schema types.
FreeOpen tool
Security & Crypto Studios
Password, Passphrase & Keygen Studio
Generate unbiased Web Crypto CSPRNG passwords, Diceware passphrases, UUID v4/v7, sortable ULIDs, NanoIDs, and 256-bit API secrets, plus audit password bit-entropy and crack time.
FreeOpen tool
Color & CSS Design Studios
Color, Palette & Contrast Studio
Convert HEX/RGB/HSL/HWB/OKLCH/CMYK, build 50–950 CSS/Tailwind scales, extract image palettes, simulate color blindness, and audit WCAG 2.1 AA/AAA + APCA contrast pairs & N×N brand matrices.
FreeOpen tool
Developer & Code Studios
Flowchart, Sequence & ER Diagram Studio
Author deterministic Flowcharts, Sequence Diagrams, and Database Entity-Relationship (ER) schemas from clean text DSLs with live SVG layout and high-DPI PNG/SVG export.
FreeOpen tool
SEO, HTTP & Web Studios
Technical SEO & Schema Studio
Preview Google SERP pixel widths & social cards, export HTML/Next.js metadata, build 6 Schema.org JSON-LD types, simulate RFC 9309 robots.txt rules, and generate sitemaps, hreflang & UTM links.
FreeOpen tool
Finance & Engineering Studios
Loan, Investment & ROI Finance Studio
Model loan/mortgage amortization with extra principal payments & CSV export, project compound interest growth, compute margin vs markup/tax, and evaluate break-even, ROI, and CAGR.
FreeOpen tool
Local-First Design
Deterministic browser tools — zero server round-trips
Every tool executes directly in your browser using standard Web Crypto, Canvas, PDF, and parser libraries — keeping sensitive code, tokens, and documents on your machine.
- 37 Focused ToolsConsolidated workspaces
- Private by DefaultFiles stay in memory
- Instant OutputNo API keys or queues
More Tools Across Categories
Direct browser utilities for calculations, charts, archives, and structured data.
Qibla Direction, Solar Ephemeris & RF Geodesic StudioNewGIS, Surveying & CAD StudiosScientific Calculator & Formula Notebook StudioNewFinance & Engineering StudioscURL, HTTP & Security Header StudioNewSEO, HTTP & Web StudiosMarkdown, Table & HTML StudioNewText, Diff & Markdown StudiosCSS Grid, Flexbox & Fluid Type StudioNewColor & CSS Design Studios