Developer tools
QR code generator
Turn text or a link into a downloadable QR code.
Base64 converter
Encode UTF-8 text as Base64 or decode Base64 back to text.
URL encoding
Encode or decode a URL component, including Unicode characters.
UUID generator
Generate cryptographically random version 4 UUIDs.
Color converter
Convert hexadecimal colors to RGB and HSL values.
Unix timestamp
Convert Unix seconds to an ISO 8601 UTC date, or reverse it.
Escape regex characters
Escape regular-expression metacharacters so text can be matched literally in a pattern.
Inspect URL
Inspect an HTTP/HTTPS URL or build a query string from an ordered list of name/value pairs.
Inspect JWT
Decode the header and claims of a three-part JWT without sending it anywhere.
Number base converter
Convert signed integers between binary, octal, decimal, hexadecimal and base 36.
IPv4 subnet calculator
Calculate network boundaries, netmask and usable address ranges from IPv4 CIDR notation.
IPv6 compressor and expander
Show the compressed and fully expanded notation of an IPv6 address.
Roman numeral converter
Convert an integer from 1 to 3999 to Roman numerals, or convert canonical Roman numerals back to a number.
Inspect HTTP headers
Turn pasted HTTP header lines into ordered JSON entries while preserving repeated names and separate values.
ULID generator
Generate Crockford Base32 ULIDs using the current millisecond timestamp and cryptographically secure randomness.
NanoID generator
Generate compact URL-friendly random IDs with cryptographically secure browser randomness.
Text encoding detector
Inspect a text file for BOM evidence, UTF-8 validity and bounded UTF-16 null-byte patterns without pretending to know the original encoding.
HTML entity encoder / decoder
Encode markup-sensitive characters as HTML entities or decode standard named and numeric entities.
Random string generator
Generate a cryptographically random string from a selected bounded alphabet.
CSS gradient generator
Generate a validated linear-gradient CSS declaration from an angle and 2–8 hex colors.
CSS box-shadow generator
Generate a validated CSS box-shadow declaration from offsets, blur, spread, color and opacity.
CSS border-radius generator
Generate CSS border-radius shorthand from one to four pixel values.
CSS clamp calculator
Calculate a linear responsive CSS clamp() expression between two viewport widths.
JSON Schema generator from sample
Generate a structural JSON Schema skeleton from one JSON sample using only observed JSON value types.
Font preview
Render a PNG preview of the font using the fixed sample “Toolivoz Aa 123 ✓”.
Font metadata inspector
Inspect font names, table structure, glyph count and mapped codepoint count.
QR code reader
Decode the text stored in a QR code image without changing the image.
TTF to WOFF2
Convert a TrueType glyf-based TTF font into a compressed WOFF2 webfont.
WOFF2 to TTF
Expand a TrueType glyf-based WOFF2 webfont into an sfnt TTF font file.
SVG minifier
Create a compact, sanitized SVG copy for smaller source size.
SVG sanitizer
Remove scripts, foreign content, event handlers and external references from an SVG.
SVG viewer
Render a sanitized SVG as a static PNG preview.
SVG to PDF
Convert one sanitized SVG document into a PDF file.
PDF to SVG
Convert the first page of a static PDF into sanitized SVG markup.
EPS to SVG
Convert one EPS/PostScript vector file into sanitized SVG markup.
SVG to EPS
Convert one SVG vector file to EPS while preserving visible geometry as far as the supported toolchain allows.
EMF/WMF → SVG
Convert one EMF or WMF vector file to SVG while preserving visible geometry as far as the supported toolchain allows.
Vector Metadata Inspector
Inspect SVG dimensions, viewBox and element counts without modifying the file.
DXF Viewer
Render one valid DXF drawing as sanitized SVG for safe inspection.
DXF to PDF
Convert one valid DXF drawing to a PDF through a sanitized SVG intermediate.
DXF Format Inspector
Inspect DXF version, layers and entity counts without changing the drawing.
Font Character Map
List mapped Unicode code points from a font as a character-map report.
TOML to JSON
Parse one UTF-8 TOML document with the standard TOML parser and export its typed structure as JSON.
JSON-LD Structure Validator
Check JSON-LD syntax and core @context/@type structure locally without fetching remote contexts.
Barcode Generator
Generate a scanner-verified Code 128 or EAN-13 barcode as a PNG image.
Barcode Reader
Read supported barcodes from one image and report the decoded value, type and location.
Image Base64 Converter
Encode one PNG, JPEG, GIF or WebP image as a MIME-qualified Base64 data URL locally.
XML Formatter
Pretty-print bounded data-oriented XML after secure parsing; DTDs, entities and mixed-content rewrites are refused.
XML Validator
Check whether bounded XML is well formed with external entities and network resolution disabled.
YAML Formatter
Format bounded data-oriented YAML with safe loading; aliases are refused when exact round-trip form cannot be preserved.
YAML Validator
Validate bounded YAML with a safe loader that does not construct arbitrary objects.
TOML Validator
Validate bounded TOML syntax without rewriting the document.
XPath Tester
Run one bounded XPath expression against safely parsed XML with DTD, entities and network resolution disabled.
Regex Tester
Test a bounded regular expression with capped matches and an evaluation timeout.
Markdown to HTML
Convert bounded Markdown to sanitized HTML while escaping raw HTML and blocking unsafe URL schemes.
MIME Type Lookup
Look up a MIME type from an extension, or known extensions from a MIME type, without inventing unknown mappings.
JSON Schema Validator
Validate one JSON instance against an embedded JSON Schema. Remote references are blocked; local references are allowed.
QR Capacity Estimator
Enter version, ECC and mode such as 10,M,byte to calculate the maximum QR payload using the installed QR engine capacity matrix.
Font Subsetter
Create a smaller TTF that keeps only the Unicode characters you specify.
@font-face CSS Generator
Generate a reviewable @font-face block from a font URL and explicit CSS font settings.
XML Structure / Namespace Inspector
XML Structure / Namespace Inspector. Bounded structural inspection only; review scope and limitations before relying on the result.
SPF Record Inspector
SPF Record Inspector. Bounded structural inspection only; review scope and limitations before relying on the result.
DMARC Record Inspector
DMARC Record Inspector. Bounded structural inspection only; review scope and limitations before relying on the result.
DKIM Record Inspector
DKIM Record Inspector. Bounded structural inspection only; review scope and limitations before relying on the result.
BIMI Record Inspector
BIMI Record Inspector. Bounded structural inspection only; review scope and limitations before relying on the result.
OpenAPI Document Inspector
OpenAPI Document Inspector. Bounded structural inspection only; review scope and limitations before relying on the result.
OpenAPI Difference Viewer
OpenAPI Difference Viewer. Bounded structural inspection only; review scope and limitations before relying on the result.
JSON Schema Difference Viewer
JSON Schema Difference Viewer. Bounded structural inspection only; review scope and limitations before relying on the result.
GraphQL Schema Inspector
GraphQL Schema Inspector. Bounded structural inspection only; review scope and limitations before relying on the result.
HAR Inspector
HAR Inspector. Bounded structural inspection only; review scope and limitations before relying on the result.
Postman Collection Inspector
Postman Collection Inspector. Bounded structural inspection only; review scope and limitations before relying on the result.
cURL Command Parser
cURL Command Parser. Bounded structural inspection only; review scope and limitations before relying on the result.
Docker Compose Inspector
Docker Compose Inspector. Offline bounded structural analysis only; no runtime execution or external network validation.
Kubernetes Manifest Inspector
Kubernetes Manifest Inspector. Offline bounded structural analysis only; no runtime execution or external network validation.
GitHub Actions Workflow Inspector
GitHub Actions Workflow Inspector. Offline bounded structural analysis only; no runtime execution or external network validation.
systemd Unit Inspector
systemd Unit Inspector. Offline bounded structural analysis only; no runtime execution or external network validation.
Nginx Configuration Inspector
Nginx Configuration Inspector. Offline bounded structural analysis only; no runtime execution or external network validation.
Apache Configuration Inspector
Apache Configuration Inspector. Offline bounded structural analysis only; no runtime execution or external network validation.
.env Sanitizer
.env Sanitizer. Offline bounded structural analysis only; no runtime execution or external network validation.
INI Inspector & Normalizer
INI Inspector & Normalizer. Offline bounded structural analysis only; no runtime execution or external network validation.
Avro Schema Inspector
Avro Schema Inspector. Offline bounded structural analysis only; no runtime execution or external network validation.
SQL DDL Structure Inspector
SQL DDL Structure Inspector. Offline bounded structural analysis only; no runtime execution or external network validation.
JWK Inspector
Inspect a public JWK locally and compute its RFC 7638 SHA-256 thumbprint without verifying any signature.
Locale Number & Date Format Tester
Preview Intl number, percent and date/time formatting for selected locale tags.
Translation Placeholder Consistency Checker
Compare supported placeholders between source and translated text.
ISO 8601 Parser & Explainer
ISO 8601 Parser & Explainer. Deterministic offline tool with explicit assumptions and bounded scope.
Timezone Offset Inspector
Timezone Offset Inspector. Deterministic offline tool with explicit assumptions and bounded scope.
ISO 8601 Duration Parser
ISO 8601 Duration Parser. Deterministic offline tool with explicit assumptions and bounded scope.
Email Deliverability Preflight
Email Deliverability Preflight. Offline bounded structural analysis only; no runtime execution or external network validation.
Config Secret Leak Scanner
Config Secret Leak Scanner. Offline bounded structural analysis only; no runtime execution or external network validation.
DMARC Aggregate Report Analyzer
DMARC Aggregate Report Analyzer. Offline bounded structural analysis only; no runtime execution or external network validation.
ads.txt / app-ads.txt Inspector
ads.txt / app-ads.txt Inspector. Offline bounded structural analysis only; no runtime execution or external network validation.
UTM Campaign Naming Validator
UTM Campaign Naming Validator. Offline bounded structural analysis only; no runtime execution or external network validation.
GA4 Event Naming Inspector
GA4 Event Naming Inspector. Offline bounded structural analysis only; no runtime execution or external network validation.