THE PASTEZAP TOOLKIT
Developer Tools
Validate data, encode strings and create identifiers in your browser.
Choose from 122 focused tools. Each page shows supported formats, practical examples and input limits before you begin. No account is required.
122 tools in Developer Tools
JSON Formatter
Format JSON with indentation and catch invalid JSON syntax.
QR Code Generator
Create and download QR codes for text, links or Wi-Fi settings.
CSV โ JSON Converter
Convert CSV with headers to JSON, or a JSON object array to CSV.
URL Encoder / Decoder
Encode or decode a URL component while preserving Unicode text.
Base64 Encoder / Decoder
Encode UTF-8 text or files to Base64 and decode Base64 locally.
File Checksum Calculator
Calculate SHA-256 or SHA-512 hashes of files locally.
Password Generator
Generate random passwords locally with configurable length and character sets.
UUID Generator
Generate one or multiple random UUID v4 identifiers locally.
Color Converter
Convert HEX, RGB and HSL colors with a live swatch.
JSON to CSV
Flatten nested JSON records and select columns before exporting CSV.
CSV Viewer & Editor
Inspect, filter and edit CSV cells, then export the edited table.
HTML Encoder & Decoder
Encode reserved HTML characters or decode character references.
JSON Minifier
Validate JSON and remove optional formatting whitespace.
JWT Decoder
Read a JWT header and payload without contacting a server.
Regex Tester
Test JavaScript regular expressions and inspect matches and capture groups.
Number Base Converter
Convert signed integers between bases 2, 8, 10 and 16 without floating-point rounding.
JSON Compare
Compare JSON structures by property paths, values and array positions.
JSON to TypeScript
Infer a TypeScript type from a JSON example, including nested objects and arrays.
Query String Parser
Decode URL query parameters while retaining duplicate keys.
Cron Expression Explainer
Explain five-field cron schedules using ranges, lists and step intervals.
JSON String Escaper
Escape text as a JSON string or decode a quoted JSON string.
HTML Formatter
Indent HTML source without displaying or executing the pasted document.
CSS Formatter
Reformat stylesheet source with consistent indentation and readable spacing.
JavaScript Formatter
Indent JavaScript source while keeping code as text.
JavaScript Minifier
Remove JavaScript comments and whitespace using a syntax-aware parser.
Glob Pattern Tester
Test a file-path wildcard pattern against the paths you provide.
Semantic Version Comparator
Validate two semantic versions and compare their precedence and change type.
URL Parser
Inspect the components and repeated query parameters of a URL locally.
Text Data URL Converter
Build a data URL from Unicode text or decode a UTF-8 text data URL.
JSON and YAML Converter
Convert JSON to YAML or parse YAML into formatted JSON.
YAML Validator and Formatter
Validate YAML syntax, format a document or export its values as JSON.
JSON and TOML Converter
Convert JSON object data to TOML or parse TOML into JSON.
JSON and INI Converter
Convert simple JSON configuration objects and INI sections.
XML to JSON Converter
Parse XML text into JSON with optional attributes and whitespace trimming.
JSON to XML Converter
Build XML from JSON with configurable root element and explicit attribute keys.
SQL Formatter
Format SQL source using the grammar of your selected SQL dialect.
GraphQL Formatter
Parse and format GraphQL documents or remove ignored whitespace and comments.
JSON Repair Tool
Repair common JSON syntax mistakes and review the resulting formatted document.
CSV and TSV Converter
Convert quoted CSV and tab-separated tables while preserving their cells.
HTML Table to JSON
Extract the first HTML table as arrays or objects with column headings.
Markdown Table Generator
Turn a quoted CSV table into escaped Markdown with your chosen column alignment.
CSS Triangle Generator
Create directional triangles using transparent borders.
CSS Loading Spinner Generator
Create a configurable loading ring with reduced-motion support.
CSS Button Generator
Generate a styled button with a visible keyboard-focus outline.
CSS Grid Playground
Preview fixed-column or responsive auto-fit grid layouts.
CSS Keyframes Generator
Generate fade, slide or pulse animations and a reduced-motion rule.
CSS Transform Playground
Preview ordered translation, rotation, scale and horizontal skew.
CSS Filter Playground
Preview blur, brightness, contrast, grayscale and hue filters.
CSS Box Model Visualizer
Inspect content, padding, border and margin widths under either box-sizing model.
CSS Unit Converter
Convert CSS lengths using explicit font, viewport and percentage reference sizes.
CSS Text Shadow Generator
Create a configurable text shadow and preview its offset, blur and color.
CSS Border Radius Generator
Set four independent corner radii and preview the generated shape.
CSS Clip Path Generator
Generate polygon clip paths from triangle, diamond, hexagon or chevron presets.
CSS Glass Effect Generator
Preview translucent panels with adjustable backdrop blur and corners.
CSS Soft Shadow Generator
Generate paired light and dark shadows for flat or inset surfaces.
CSS Flexbox Playground
Preview direction, alignment, wrapping and gap with five example items.
CSS Container Query Helper
Generate a grid breakpoint based on container width with a configurable preview.
CSS Scrollbar Styler
Generate standard and WebKit scrollbar styles with a scrolling preview.
Text Hash Generator
Hash exact UTF-8 text with SHA-256, SHA-384, SHA-512 or legacy algorithms.
AES Text Encryptor
Encrypt and authenticate text locally, or decrypt a PasteZap encrypted envelope.
RSA Key Pair Generator
Generate a local RSA-OAEP SHA-256 public/private PEM key pair.
TOTP Code Generator
Calculate RFC 6238 authentication codes from a Base32 secret and explicit settings.
bcrypt Hash Generator and Verifier
Generate salted bcrypt hashes or compare a password with an existing bcrypt hash.
htpasswd bcrypt Generator
Create an Apache-compatible username and bcrypt password entry.
Random Password Entropy Calculator
Calculate theoretical entropy for independent uniform character choices.
Nano ID Generator
Generate unbiased random IDs with a custom distinct-character alphabet.
ULID Generator
Generate timestamped Crockford Base32 identifiers with 80 cryptographically random bits.
Snowflake ID Layout Calculator
Construct a decimal ID from timestamp, epoch, worker ID and sequence.
MongoDB ObjectId Generator
Generate valid BSON ObjectIds with timestamp, process randomness and a counter.
IPv4 to IPv6 Mapped Address
Convert a canonical IPv4 address to IPv4-mapped IPv6 notation.
IPv4 Subnet Calculator
Calculate CIDR masks, address ranges and usable IPv4 hosts locally.
CSS Minifier
Reduce CSS whitespace and comments without restructuring rule order.
HTML Minifier
Minify HTML conservatively while preserving inline CSS and JavaScript source.
JavaScript String Escaper
Escape text into a safe double-quoted literal or decode a JSON-compatible string.
JSON Path Finder
Find keys and primitive values by substring and report paths and JSON pointers.
XML Formatter
Format parsed XML with two-space indentation and preserve element order.
JSON Schema from Sample
Infer a draft-07 schema from a bounded JSON example.
JSON to Zod Schema
Infer Zod object schemas with strict keys and nested sample-based validation.
JSON to Go Struct
Generate Go structs with exported fields and original JSON property tags.
JSON to Rust Struct
Generate Rust structs with serde annotations from a bounded JSON sample.
JSON to C# Class
Generate C# classes using System.Text.Json property-name attributes.
MIME Type Lookup
Look up a filename extension or list extensions associated with a MIME type.
curl to Fetch Converter
Turn a limited literal curl request into JavaScript Fetch source without sending it.
Cron Expression Builder
Build a validated five-field Unix cron expression.
Canonical Tag Generator
Normalize an HTTP(S) URL into an escaped canonical link tag.
Hreflang Tag Generator
Generate alternate language link tags from JSON language/URL rows.
Open Graph Tag Generator
Generate escaped Open Graph tags from page metadata.
Twitter / X Card Generator
Generate escaped social card tags for shared pages.
Structured Data JSON-LD Generator
Wrap actual structured-data properties in safe JSON-LD markup.
XML Sitemap Validator
Check sitemap structure, location syntax and optional values.
RSS and Atom Feed Generator
Build escaped RSS 2.0 and Atom feeds from JSON entries.
Gitignore Generator
Merge bundled stack ignore rules into a deduplicated file.
EditorConfig Generator
Generate project whitespace and newline settings.
README Generator
Create a Markdown README from structured project information.
Package JSON Scaffold
Generate a private Node ESM package manifest.
Dockerfile Starter Generator
Generate a basic container file for a selected application stack.
GitHub Actions CI Starter
Generate a Node CI workflow with minimal repository permissions.
Apache Htaccess Starter
Generate a commented Apache HTTPS-redirection baseline.
Nginx Static Site Starter
Generate a static-site server block for an entered domain.
Hex and ASCII File Viewer
Inspect a bounded byte window of any local file.
Multiple File Checksums
Compute MD5, SHA-1, SHA-256 and SHA-512 for a local file.
SQL Comment and Whitespace Minifier
Reduce SQL whitespace while retaining quoted literal contents.
User-Agent Parser
Inspect browser, engine, operating-system and platform hints.
CSS Selector Specificity
Calculate ID, class and type specificity for each selector.
CUID2 Generator
Generate collision-resistant CUID2 identifiers with local cryptographic randomness.
SSH Public Key Fingerprint
Calculate OpenSSH SHA-256 and legacy MD5 public-key fingerprints.
Password Composition Checker
Review password composition with transparent local checks.
Email Header Analyzer
Summarize received chains and authentication claims from pasted mail headers.
HTTP Status Code Lookup
Search a bundled IANA status registry snapshot by code or description.
JSON Flatten and Unflatten
Convert nested objects into escaped flat paths and reconstruct them.
Regex from Positive and Negative Samples
Infer fixed-position character classes with an exact-alternative fallback.
JSON Schema Draft-07 Validator
Validate bounded JSON against a local draft-07 schema in a disposable worker.
Branded QR with Logo
Create a high-correction PNG QR code with an optional local logo.
Batch QR Code Generator
Encode each input line into its own SVG QR code and download a ZIP.
Contact vCard QR Generator
Build a vCard 3.0 contact payload and its QR image.
Multi-Payload QR Generator
Create QR codes for text, URLs, email, SMS, phone, calendar or coordinates.
JSON and Java Properties Converter
Convert flat multilingual string dictionaries between JSON and Java properties.
Table Format Converter
Convert rectangular string tables between CSV, TSV, JSON and Markdown.
DMARC Record Generator
Draft a DMARC TXT policy and reporting mailbox without modifying DNS.
SPF Record Generator
Build an SPF TXT draft from sender networks and include domains.
OpenPGP Encrypt and Decrypt
Encrypt text with a password or recipient public key and decrypt an armored message.
X.509 Certificate Inspector
Read certificate identity, dates, extensions and a SHA-256 fingerprint.