Coobbi
ToolsMobile AppsGuidesAboutOpen File Inspector
Private browser tools

Understand any file.
Right in your browser.

Identify formats, inspect bytes, extract strings and calculate hashes — locally, without uploading your files.

Inspect a file Explore all tools
No uploadNo installStatic analysis only
File Inspector / result
JAR
sample-project.jar184.2 KB
Processed locally
Format
Java Archive (JAR)
Confidence
High · ZIP structure + manifest
Signature
50 4B 03 04
Entries
128 files
SHA-256
8f2a4ce72d60…e7284

✓ Analysis complete. Your file was not uploaded.

Web tools

Focused tools for file analysis

Fast, private and built for real files—everything runs in your browser.

Start with File Inspector →
Any file

File Inspector

Identify unknown files from signatures, structure and extension agreement.

Open tool →PE / EXE

EXE Inspector

Inspect PE headers, architecture, sections, imports and exports.

Open tool →PE / DLL

DLL Inspector

Analyze Windows libraries locally without loading or executing them.

Open tool →HEX / ASCII

Hex Viewer

Read file bytes by offset in a focused hexadecimal and ASCII view.

Open tool →Text / Binary

Strings Viewer

Find readable text embedded in local files with byte offsets.

Open tool →SHA / MD5

Hash Calculator

Calculate SHA-256, SHA-1 and MD5 fingerprints locally.

Open tool →
01Local by design

Files are processed on your device, not uploaded to Coobbi.

02Focused, not bloated

Each tool does one technical job with clear, inspectable results.

03Safe static analysis

Executables and libraries are inspected, never run or loaded.

Mobile apps

Small apps. Useful superpowers.

Focused utilities for unusual files, Java programs and Scratch projects.

Explore all 12 apps →
Jar Runner iconAndroid

Jar Runner

Run compatible JAR files, Java applications, Swing apps and J2ME software on Android.

Jar Runner was previously known as Jre4Android.

Learn moreGoogle Play
JAR DLL EXE File Viewer iconiOS and iPadOS

JAR DLL EXE File Viewer

Open and inspect JAR, ZIP, CLASS, DLL and EXE files on iPhone and iPad. Browse archives, inspect Java CLASS files and review PE file structure locally.

Previously known as JarInspector: JAR Viewer.

Learn moreApp Store
SB3 File Opener & Player iconiOS and iPadOS

SB3 File Opener & Player

Open and play Scratch-compatible SB3 project files locally on iPhone and iPad.

Previously known as SB3 Game Player.

Learn moreApp Store
DLL File Viewer & EXE Viewer iconAndroid

DLL File Viewer & EXE Viewer

Open DLL and EXE files on Android, inspect Windows executable metadata and view package details.

Learn moreGoogle Play
Guides

Practical answers for uncommon files

Browse all guides →
Java on Android

How to Run JAR Files on Android

Launch compatible Java apps with a dedicated Android runtime.

Read guide →JAR inspection

How to View MANIFEST.MF

Find Main-Class, version and package metadata inside a JAR.

Read guide →Scratch projects

Open SB3 Files on iPhone & iPad

Import and play Scratch-compatible projects locally on iOS.

Read guide →
Start with a local file

See what is inside—without sending it anywhere.

Choose a focused browser tool or explore Coobbi apps for mobile workflows.

Open File Inspector