UD5 Toolkit
MIME Type â Extension Lookup - Online Quick Reference
Search by MIME or file extension to see the corresponding type. Helpful when configuring web servers. Static.
File Extension Database Lookup - Online Search Type
File Extension Lookup
Instant details for any file extension â type, MIME, programs & more.
Enter a file extension with or without the dot.
Popular Extensions
| Extension | Type | MIME | Programs |
|---|
Click any row to see full details.
Frequently Asked Questions
A file extension is the suffix at the end of a filename (e.g.,
.txt, .jpg) that indicates the file type and helps the operating system determine which application to use to open it.
You can use our lookup tool to identify the file type. Once you know the format, you can install the recommended program or use a universal file viewer like VLC or File Viewer Plus.
Yes, but simply renaming the extension does not convert the file. It might become unreadable. For example, changing
document.docx to document.pdf won't create a PDF. Use proper conversion software instead.
MIME (Multipurpose Internet Mail Extensions) type is a standard way of identifying files on the Internet according to their nature and format. For example,
text/html for HTML files and image/png for PNG images.
Common extensions include
.pdf (documents), .jpg/.png (images), .mp3 (audio), .mp4 (video), .zip (compressed archive), .html (web pages), and .exe (executable). Browse our table above for more.
TLD & Domain Extension Lookup - Online All Endings
Search a complete list of all topâlevel domains. See which still have availability. For brand naming. Static reference.
DNS Lookup - Online Domain Records Checker (A, MX, CNAME)
Query DNS records for any domain directly from your browser using DNS-over-HTTPS. See A, AAAA, MX, CNAME, and TXT records. No logs.
File Type from Magic Bytes Detector - Online Identify Unknown Files
Drop a file and see its detected type based on the first bytes (magic number). Identifies hundreds of formats. Local.
IDBâKeyval Explorer - Online Simple KeyâValue Storage Viewer
Browse, edit, and delete keys stored by the idbâkeyval library in your browser. Handy for debugging PWAs.
File MIME Type & Magic Bytes Detector - Online
Drop a file to see its MIME type and the first few magic bytes (hex and ASCII). No upload, works instantly.
Shopping List Builder - Online Categorized Grocery Checklist
Create categorized shopping lists (produce, dairy, meat, etc.). Add items, check them off, and print. Data stored in your browser. Never lose a list.
Acronym Expander - Online Find What It Stands For
Enter an acronym and see its most common full forms. Static dictionary. No internet needed after load.
Focus Order Analyzer - Online Tab Navigation Check
Enter a URL and extract tabâindex order violations and focusable elements. Quick accessibility audit. Clientâside fetch.
Robots.txt Tester - Online Check URL Allow/Disallow
Enter a URL and a userâagent to see if it is allowed or blocked by the robots.txt file. Quick bot validation.
SQL Date Format Generator - Online for MySQL, PostgreSQL, etc.
Build a date format string for SQL by toggling components (YYYY, MM, DD). See a live example for different databases.
Structured Data Testing Tool - Online Validate Rich Results
Paste your JSONâLD or Microdata and test it against Google's Rich Results criteria. Get warnings. Local linter.
Email Header Analyzer - Online SPF, DKIM, DMARC Check
Paste raw email headers and see authentication results (SPF, DKIM, DMARC) in a readable table. Find spoofing attempts.
Poetry Meter Detector â Online Iambic, Trochaic, etc.
Paste a line of poem and see which syllable stresses create a particular meter. Educational tool.
Image Format MIME Checker - Online Identify True Type
Drop an image that might have wrong extension and see its real format (JPEG, PNG, WebP) based on header bytes.
BackgroundâBlendâMode Explorer - Online Layer Patterns
Stack multiple background images and blend them with colors. Create unique textures. Copy the CSS code instantly.
Text File Merger - Online Combine Multiple TXT
Upload multiple text files and concatenate them into one, with optional separators. No upload; processed instantly.
SQL Indenter - Online Just Prettify Your Queries
Format your SQL code with consistent indentation. Choose 2 or 4 spaces. No syntax validation, just neat output.
Audio Joiner - Online Concatenate Multiple Files
Upload multiple audio files and join them into a single continuous track. Add crossfade. All local.
Base32 Encoder & Decoder - Online Base32 Converter
Encode or decode text using Base32 scheme. Ideal for legacy systems and data obfuscation. Works completely offline in your browser for maximum security.
PDF Compressor - Online Reduce File Size Locally
Shrink a PDF file size with configurable image quality and object removal. All processing stays in your browser.
SD Card Formatter Types - Online File System Guide
Understand which file system to choose for your SD card based on capacity and device. A quick guide, no actual formatting.
Digital Photo Album â Online Arrange & Caption Memories
Create a simple grid or carousel album with local images and captions. Export as printable PDF. Private.
SSL Certificate Checker - Online TLS Expiry & Info Tool
Inspect any website's SSL/TLS certificate details: issuer, expiry date, subject, and SANs. Verify certificate chains. All checks are private and require no server upload.
HTML Class Name Shortener â Online Reduce File Size
Replace long CSS class names with short random strings. Map generated. For production optimization.
Local JSON Data Explorer - Online Browser Storage Viewer
View, edit, and manage JSON objects saved in your browser's localStorage. Delete, export, or import keys. No setup.
Base64 Encoder & Decoder - Online Base64 Converter
Convert text and files to Base64 or decode Base64 back to original content. Processed locally with no server upload, ensuring complete data security.
CAA Record Generator - Online DNS Certification Authority
Create a CAA DNS record to specify which certificate authorities can issue SSL certs for your domain. Prevent misâissuance.
Sorting Algorithms Visualizer - Online Bubble, Quick & Merge
Watch classic sorting algorithms step through a randomized bar chart. Adjust speed and array size. Great for learning algorithm efficiency.
Decision Tree Builder - Online Visual Yes/No Path
Build a simple decision tree by adding yes/no nodes. Flowchart style. Export as text outline.