Online tools for development, office work, and media tasks
Open a tool, finish the task, and move on. Common tasks run directly in your browser with no software installs.
Category
Development
JSON Formatter
Validate, prettify, and minify JSON online, extract nested JSON from strings, and convert between JSON, YAML, and .env with entity generation.
JSON to YAML
Convert JSON text to YAML for configuration cleanup and format migration.
JSON to Proto
Generate a proto3 message draft from a JSON sample, inferring fields, arrays, and nested objects for gRPC and Protobuf schema planning.
YAML to JSON
Convert YAML text to JSON for API debugging and programmatic use.
HTTP Request Code Generator
Enter method, URL, headers, and body once to generate cURL, fetch, and Python requests examples.
Basic Auth Generator
Generate an HTTP Basic Auth header and htpasswd file line from a username and password for API debugging and Nginx/Apache access protection.
JS Formatter
Format minified or poorly spaced JavaScript into readable indentation for frontend debugging and code review.
JS Minifier
Remove extra whitespace and comments from JavaScript code for quick small-script minification.
JavaScript Obfuscation Decoder
Decode common JavaScript obfuscation patterns, escaped strings, Base64, and fromCharCode snippets for inspection.
Timestamp Converter
Convert between second or millisecond timestamps and readable datetime values across timezones.
Cron Parser
Parse 5-field Cron expressions and inspect upcoming run times with readable summaries.
Timezone Converter
Convert local time to another timezone with support for Beijing time, UTC, and major city comparisons. Useful for meetings, release schedules, and cross-region coordination.
URL Encode
Percent-encode a URL or parameter fragment for safer links and request debugging.
URL Decode
Decode percent-encoded URL text back into readable content for inspection and debugging.
Base64 Text & File Converter
Encode and decode Base64 text, and convert between regular files and Base64 content in one page.
Hash Calculator
Calculate MD5, SHA1, SHA256, and SHA512 for text so you can compare digest values quickly.
Text Diff
Compare old and new text line by line for config, copy, and snippet changes.
Regex Tester
Test regular expression matches and replacements online with presets and highlighted results.
CSV & JSON Converter
Convert CSV to JSON or JSON to CSV for imports, exports, mock data, and API debugging.
UUID Generator
Generate UUID v4 values in batches with uppercase and no-hyphen options for testing, temporary IDs, and API debugging.
Text to JSON Array
Convert lines or comma-separated text into a JSON array for API parameters, config values, and batch cleanup.
Base Converter
Enter an integer, choose the source base, and review common converted results for debugging, protocol inspection, and quick number conversion.
String & Bytes Converter
Convert strings to bytes and bytes to strings online with UTF-8, UTF-16, Hex, Base64, \x escapes, and decimal byte arrays.
Full-width / Half-width Converter
Detect and convert full-width and half-width characters for OCR cleanup, imports, and mixed Chinese-English text.
File Header Inspector
Read file header hex and detect likely file type for mismatched extensions, upload issues, and unknown files.
2FA / TOTP Code Generator
Enter a Base32 Secret or otpauth URI to generate 2FA, TOTP, and OTP codes locally in your browser for two-step verification checks and temporary troubleshooting.
Image to Base64
Upload an image and convert it to Base64 text for Data URLs, embeds, and API transport.
Base64 to Image
Decode Base64 image text into a previewable image and download the result.
JWT Decode & Key Inspect
Decode JWT locally and inspect PEM, JWK, or certificate key material without performing signature verification.
Mojibake Repair & Encoding Detect
Paste garbled text, try to recover readable output, and inspect likely encoding mismatch paths with candidate results.
Mojibake Generator
Turn normal text into common mojibake output for charset mismatch demos, test samples, and bug reproduction.
WebSocket Debug Tool
Connect to ws or wss endpoints, send messages, and inspect realtime responses for WebSocket integration and troubleshooting.
Color Palettes & References
Browse practical color palettes with style filters, keyword search, and one-click color copying for design and frontend work.
Cookie Converter
Convert Cookie header text, JSON, and Netscape cookie files online with automatic input detection for browser import, debugging, and migration.
Markdown / HTML / Text Converter
Convert between Markdown, HTML, and plain text for content cleanup, webpage extraction, and publishing workflows.
Category
Video
Subtitle Converter
Convert subtitles between SRT, WebVTT, ASS/SSA, LRC, SBV, CSV, JSON, and plain text for video publishing, editing, and cleanup.
Video Converter
Convert video files to MP4, WebM, MOV, or MKV for upload compatibility, browser playback, and routine media cleanup.
Video Snapshot & Thumbnails
Capture single-frame snapshots and thumbnail sheets from video for cover selection, previews, and quick content checks.
Video to GIF
Convert a short video clip into an animated GIF with control over start time, duration, width, and frame rate.
Category
Office
Handheld Barrage
Turn text into a bold fullscreen phone sign for landscape display, events, and quick on-site messages.
Word Cloud Generator
Generate a word cloud from CSV or frequency lists with local preview, palette controls, and PNG export for reports and content analysis.
Emoji Search
Browse emoji by category, search by keyword, Unicode, or shortcode, and copy symbols with one click.
Ebook Converter
Upload EPUB, MOBI, AZW3, TXT, or HTML files and convert them to common ebook formats for readers, archiving, printing, and sharing.
OCR Text Extract & Cleanup
Extract text from screenshots, scans, and document images, then clean line breaks, spacing, blank lines, and page noise for easier reuse.
PDF Merge, Split & Extract
Merge PDFs, extract selected pages, or split PDFs into smaller files for office documents, scanned files, and archive cleanup.
PDF Merge
Merge multiple PDFs online, add files in batches, reorder or remove items, and download one combined PDF.
PDF Extract Pages
Extract selected pages from a PDF with single page and range expressions, then download a new PDF.
PDF Split
Split a PDF by fixed page count and download the generated parts as a ZIP file.
Category
Calculators
Mortgage Calculator
Estimate monthly payment, total interest, and total repayment for equal payment and equal principal mortgage plans.
Mortgage Prepayment Calculator
Compare lower-payment and shorter-term mortgage prepayment options with the original loan details, paid months, and prepayment amount.
BMI Calculator
Calculate BMI, body category, and a reference healthy weight range from height and weight.
BMR & TDEE Calculator
Estimate basal metabolic rate, daily energy expenditure, and reference calorie targets.
Meal Calorie Calculator
Calculate total calories, total weight, and per-serving calories from ingredients and serving count.
Category
Network
My Public IP
Check your current public IP, forwarded proxy headers, and country or region information for network troubleshooting.
HTTPS Certificate Checker
Inspect HTTPS certificate expiry, issuer, SAN domains, and fingerprints for certificate checks and deployment troubleshooting.
CSR Generator
Generate a CSR certificate signing request and PEM private key with SAN domains, RSA, and ECDSA support.
Domain WHOIS Lookup
Look up domain WHOIS records, registrar, name servers, registration dates, and status details for ownership checks and investigations.
DNS Lookup
Query A, AAAA, CNAME, MX, NS, TXT, PTR, SOA, and CAA DNS records for resolution and mail configuration troubleshooting.
IP Information Lookup
Inspect IP version, reverse DNS, private or reserved flags, and basic network attributes for log analysis and troubleshooting.
IP Geolocation Lookup
Look up country, region, city, coordinates, timezone, and ISP information for an IP address.
Subnet Calculator
Enter an IP, CIDR, or netmask to view network address, broadcast address, usable host range, and host count.
Category
Image
Image Compression
Upload a JPG or JPEG image, compress it online, and download the smaller result for uploads, forms, and publishing.
Image Processing
Resize images and convert between JPEG, PNG, and WebP in one page for routine publishing and asset cleanup.
WebP to JPG
Upload a WebP image and convert it to JPG or JPEG online for chat sharing, document inserts, form uploads, and older-device compatibility.
JPG to WebP
Upload a JPG/JPEG image and convert it to WebP for smaller file sizes.
PNG to JPG
Upload a PNG image and convert it to JPG/JPEG for general publishing workflows.
HEIF to JPG
Upload HEIC or HEIF images and convert them to JPG or JPEG online for iPhone photo uploads, chat sharing, document use, and older-device compatibility.
Image Rotate
Rotate an image by 90°, 180°, or 270° online and download the result.
Image Crop
Crop image size and aspect ratio in the browser, then export JPG, PNG, or WebP.
Image Info Viewer
Inspect image format, file size, dimensions, aspect ratio, and basic file header details locally in the browser.
Signature Image
Draw a signature in the browser and export a transparent PNG for documents, forms, and temporary approvals.
Background Canvas Generator
Generate a custom-size background canvas for video covers, image editing, social posts, and phone wallpapers.
Image Watermark
Add text or image watermarks with live preview, drag positioning, opacity, size, rotation, and tiling controls.
Images to PDF
Upload JPG, PNG, and other images, reorder them, and merge them into one PDF for homework, scans, receipts, and office materials.
QR Code Generator & Scanner
Generate QR codes from text or links and decode uploaded QR images for sharing, printing, and scan troubleshooting.
Image EXIF Viewer & Cleaner
View image EXIF metadata and strip it before download to inspect capture details, orientation, timestamps, and privacy-sensitive fields.
Category
Audio
WAV Trim & Gain Adjust
Trim WAV clips and adjust gain for simple audio cleanup, sample extraction, and lightweight editing.
Audio Info Viewer
Inspect codec, bitrate, sample rate, channels, and duration before transcoding, publishing, or archiving.
WAV Header Inspector
Inspect WAV RIFF headers, fmt/data chunks, and chunk details to diagnose structure and compatibility issues.
Audio Loudness Normalize
Normalize loudness across audio files to reduce abrupt volume changes in podcasts, voiceovers, and short videos.
Audio Format Converter
Convert audio files to MP3, AAC, M4A, WAV, FLAC, OGG, or OPUS for compatibility and asset cleanup.
Extract Audio & Trim Silence
Extract audio from video or trim silence from audio online for media cleanup, interviews, and lightweight editing prep.