Paste raw email headers and see the full routing chain with per-hop timing, SPF / DKIM / DMARC authentication results, security anomaly flags, and a full header dump — all client-side.

Paste raw email headers and MailTap traces the full delivery path — every relay hop with timestamps and delays, SPF/DKIM/DMARC authentication results, security anomaly detection (reply-to mismatch, auth failures, missing headers), and a complete annotated header dump. Nothing leaves your browser.more

• Route Trace
• Auth Scan
• Header Map

Decode and sign JWTs, compute HMAC signatures, generate live TOTP codes, hash text and files, and convert Unix timestamps — all client-side.

A complete authentication token workbench: decode and sign JWTs, compute HMAC signatures, generate live TOTP codes, hash text and files, create UUIDs and ULIDs, and convert Unix timestamps — all without leaving the browser.more

• JWT
• HMAC
• TOTP
• Hash
• Unix Time

Generate UUIDs (v1–v7) and ULIDs, build strong passwords with configurable character sets, and create memorable passphrases — all cryptographically random, all client-side.

A cryptographically secure credential workbench: generate UUID v1–v7 and ULID identifiers, build passwords with configurable entropy, and create diceware-style passphrases — all computed in the browser via the Web Crypto API.more

• UUID / ULID
• Password
• Passphrase

Live match highlighting, capture groups, named groups, flag toggles, replace preview, and per-match metadata — all in one view.

Write, test, and understand regular expressions against real input — with live match highlighting, capture group metadata, replace preview, flag toggles, and a per-token explainer for every part of the pattern.more

• Live Match
• Live Replace
• Rune Explain

Base64, Base32, Base58, and Hex encode / decode, plus image-to-data-URI conversion. All in-browser.

Reach for ByteSmith when an API response, JWT, attachment, or config value needs decoding — or when you need to encode content for a URL, an email header, or an inline HTML attribute.more

• Base64
• Base32 / Base58
• Image → Data URI
• Hex

Convert between formats, pretty-print and validate, run JSONPath queries, validate against a schema, or minify — all from one pane.

The go-to workbench for any structured data task: format and validate JSON, XML, YAML, TOML, CSV, and SQL; convert between formats; run JSONPath queries; validate against a JSON Schema — all in the browser.more

• Format Anneal
• Convert Flux
• Minify Quench

Clean side-by-side diff for API responses, config files, SQL schemas, or any two text blocks.

Paste two text blocks and see exactly what changed — split side-by-side or unified view, character-level highlighting within changed lines, and instant results with no file upload, no login, no size limit.more

• Split
• Unified
• Char-level

Paste CSV, JSON, TSV, or a markdown table and get a clean chart instantly — bar, line, area, pie, donut, or scatter. Exports as self-contained SVG, PNG, or data URI with no runtime dependency.

Paste CSV, JSON, TSV, or a markdown table and ChartMill renders a clean chart — bar, horizontal bar, line, area, pie, donut, or scatter. Exports as a self-contained SVG (no runtime dependency), PNG at 2× resolution, or base64 data URI. Nothing leaves your browser.more

• Bar / Line
• Pie / Donut
• Scatter Cast

Calculate optimal bedtimes and wake times based on 90-minute sleep cycles. Includes a nap calculator with time-of-day impact warnings, chronotype adjustment, caffeine and alcohol cutoffs, sleep architecture visualization, and sleep debt tracker.

DreamPress computes optimal bedtimes and wake times based on your sleep cycle length, fall-asleep latency, age group, and chronotype — and shows you exactly when to nap, stop caffeine, and avoid alcohol to protect tonight's sleep.more

• Bedtime Cast
• Wake Forge
• Nap Mill
• Debt Tally

Paste any text and see every character's codepoint, UTF-8 bytes, UTF-16 units, HTML entities, CSS and JS escapes, Unicode name, block, category, and script — plus flags for invisible characters, bidi controls, and homoglyphs.

Paste any text and GlyphWorks breaks it down character by character: Unicode codepoint, official name, block, category and script, UTF-8 and UTF-16 encodings, HTML entities, CSS escape, and JavaScript escape — plus security flags for invisible characters, bidi control characters, and homoglyphs that could be used in spoofing attacks.more

• Glyph Inspect
• Encode Map
• Unicode Lore

Optimize SVGs by stripping editor metadata, comments, and hidden elements with multipass support — inspect source with live preview, color extraction, a11y and security signals — or convert to PNG, Data URI, CSS snippet, and React JSX. Entirely in the browser.

Optimize SVGs for production with multipass SVGO, inspect embedded colors and metadata, or convert to PNG, Data URI, CSS background, and React JSX — the complete browser-based SVG workbench, no upload required.more

• Optimize
• Inspect
• Convert

Construct a CRON expression with a visual field builder, get an instant plain-English explanation, and see 20 next run times in any timezone. Supports POSIX, Quartz (Spring), AWS EventBridge, GitHub Actions, and Kubernetes dialects.

CronJig builds and decodes CRON expressions visually — paste an expression to get a plain-English explanation, or use the field builder to generate one from scratch. Shows 20 next run times in any IANA timezone, a fire-frequency heatmap, dialect-aware code snippets, and inline warnings for common scheduling mistakes.more

• Cron Build
• Cron Explain
• Fire Cast
• Heat Map

Generate a production-ready favicon package entirely in your browser. Paste a letter, drop an emoji, or paste raw SVG — FaviSmith produces ICO, every PNG size, a web manifest, and the HTML snippet, bundled as a ZIP.

Generate a complete favicon package — ICO, every PNG size, web manifest, and HTML snippet — from a letter, emoji, or SVG, entirely in the browser. No upload, no account, no server.more

• Text Forge
• Emoji Cast
• SVG Smelt

Full PITI payment breakdown, amortization schedule, equity milestones, and scenario modeling — without the lender pitch.

A complete mortgage and loan amortization workbench: compute full PITI payments, model extra payments, visualize the equity curve, and export the amortization schedule — no ads, no lender prompts, nothing to sign up for.more

• Payment Forge
• Amort Cast
• Scenario Mill

HECM reverse mortgage calculator — principal limit, draw options, 60% first-year rule, and year-by-year balance growth. No lead forms, no phone calls.

Model a Home Equity Conversion Mortgage (HECM): see your gross and net principal limit, compare lump sum vs. monthly tenure vs. line of credit, and project how your loan balance grows against your home value over time.more

• Principal Forge
• Draw Cast
• Balance Trace

Full depreciation schedules for vehicles, equipment, computers, real estate, and any depreciating asset — all five accounting methods plus full MACRS with §179 and bonus depreciation. No lead gen, no upsell.

DrossTally computes full depreciation schedules for any asset using all five standard accounting methods — straight-line, double declining balance, 150% declining balance, sum-of-years-digits, and units of production — plus MACRS with current §179 and bonus depreciation figures.more

• Book Methods
• MACRS (Tax)