Web and SEO
49 tools
Headers, redirects, DNS, robots.txt, sitemaps, meta and Open Graph checks
oerli.ai321 tools for web, data and text
The small tools you reach for every day
Format JSON, test a regex, decode a JWT or check a redirect without installing anything. Most tools run entirely in your browser, so your input stays with you.
No sign-up310 run offline in your browserFree to use
Six toolboxes
Pick a topic, find the tool
Data and formats
43 tools
JSON, CSV, SQL and Markdown: query, compare, reshape, preview
Text and lines
52 tools
Sort, dedupe, wrap and count lines, regex and string helpers
Encode and secure
63 tools
Base64, hashes, HMAC, JWT, UUID and ULID, checksums and classic ciphers
Color and CSS
36 tools
Palettes, contrast, gradients, shadows, grid and flex playgrounds
Numbers and time
78 tools
Units, percentages, timestamps, statistics, geometry and everyday calculators
Your input stays in your browser
310 of 321 tools compute everything locally: nothing you paste is uploaded or stored. The 11 lookup tools, such as DNS, headers, redirects and whois, send only the address you enter and carry a lookup mark in the catalog.
Catalog
All 321 tools in one place
- Base64 EncoderEncode and decode Base64 strings, files, and images. Supports URL-safe encoding.
- Meta Tag CheckerlookupPreview how a URL appears in Google, Twitter, and OpenGraph. Check meta tags, JSON-LD, and tech stack.
- API TesterlookupTest any API endpoint. Send requests with custom methods, headers, and body. View response details.
- Redirect CheckerlookupTrace the full redirect chain of any URL. See every hop, status code, and timing.
- JWT DecoderDecode and inspect JWT tokens. View header, payload, signature, expiry status.
- Password GeneratorGenerate strong passwords with custom length, characters, and entropy calculation.
- Color PickerPick colors, convert HEX/RGB/HSL, generate palettes, check WCAG contrast ratios.
- Hash GeneratorCompute SHA-1, SHA-256, SHA-384, SHA-512 hashes of pasted text. Client-side.
- Robots.txt TesterlookupTest which paths are allowed or blocked by a site's robots.txt for any user-agent.
- HTTP Header AnalyzerlookupAnalyze all response headers and check security header coverage (HSTS, CSP, etc.).
- URL EncoderEncode, decode, and parse URL query strings. Client-side, instant.
- Markdown PreviewLive Markdown editor with GitHub-style preview and HTML export.
- Text DiffCompare two texts and highlight differences. Side-by-side view with additions and removals.
- Lorem IpsumGenerate placeholder text. Choose paragraphs, sentences, or words with word count stats.
- Regex TesterTest regular expressions with live match highlighting, flags, and match details.
- Unix TimestampConvert between Unix timestamps and human-readable dates. Live clock, relative time.
- DNS LookuplookupQuery DNS records for any domain: A, AAAA, MX, NS, TXT, CNAME. Reverse DNS included.
- Word CounterCount words, characters, sentences, paragraphs. Reading time and top word frequency.
- Cron ParserParse cron expressions, see next 10 executions, and pick from common presets.
- QR Code GeneratorGenerate QR codes for URLs, text, or data in your browser. Custom colors, sizes, PNG and SVG download.
- ID GeneratorGenerate UUIDs, ULIDs, and NanoIDs. Batch generation, click to copy.
- Placeholder ImageGenerate placeholder images as SVG. Custom size, colors, text. Presets for common formats.
- Chmod CalculatorVisual chmod permission calculator. Toggle R/W/X, see octal and symbolic notation.
- Aspect RatioCalculate and convert aspect ratios. Visual preview, common presets, resize calculator.
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