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Custom Extension GeneratorNew
Generate any extension — .backup, .data, .cache — backed by a real format that opens in software.
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Browse By File Category

Select a specialized category to find exactly the mock files you need for your testing scripts.

9

Documents & Text

PDFs, spreadsheets, presentations, and rich text formats for testing documents.

Supported Formats Directory
10

Image Files

Standard, vector, web-optimized, and lossy/lossless image files.

Supported Formats Directory
15

Code & Data

Source code files, data exchange structures, markup, and database scripts.

Supported Formats Directory
6

Archives & Compressed

Standard archives and high-compression container formats for directory packages.

Supported Formats Directory
6

Video Files

Common video containers and web-ready streaming media formats.

Supported Formats Directory
6

Audio Files

Compressed and uncompressed music, soundtrack, and audio stream formats.

Supported Formats Directory
6

Executables & System

Disk images, application executables, scripts, and installer packages.

Supported Formats Directory

Supported Formats Directory

Select an extension to immediately download custom mock files of any size.

PDF

PDF

Documents & Text
Portable Document Format

Universal formatting standard for document viewing, printing, and exchange.

File Size Preset: 10KB100MB
DOCX

DOCX

Documents & Text
Microsoft Word Document

Modern XML-based standard text document format used primarily by MS Word.

File Size Preset: 10KB100MB
DOC

DOC

Documents & Text
Microsoft Word Legacy Document

Legacy binary text document format utilized in Word 97-2003.

File Size Preset: 10KB100MB
XLSX

XLSX

Documents & Text
Microsoft Excel Spreadsheet

Grid-based tabular data sheets featuring functions, calculations, and tables.

File Size Preset: 10KB100MB
PPTX

PPTX

Documents & Text
Microsoft PowerPoint Presentation

Standard slide presentation decks featuring slide layouts, images, and text shapes.

File Size Preset: 10KB100MB
RTF

RTF

Documents & Text
Rich Text Format

Legacy cross-platform formatted text standard supported by most word processors.

File Size Preset: 10KB50MB
TXT

TXT

Documents & Text
Plain Text File

Raw UTF-8 text with absolutely no styling or formatting applied.

File Size Preset: 1KB100MB
EPUB

EPUB

Documents & Text
Electronic Publication (Ebook)

Open e-book standard containing HTML pages, styles, images, and metadata.

File Size Preset: 10KB10MB
MD

MD

Documents & Text
Markdown Document

Lightweight plain text markup standard featuring human-readable format symbols.

File Size Preset: 1KB10MB
PNG

PNG

Image Files
Portable Network Graphics

Lossless raster image format supporting alpha transparency.

File Size Preset: 10KB100MB
JPG

JPG

Image Files
Joint Photographic Experts Group

Lossy compressed image format widely used for digital photos.

File Size Preset: 10KB100MB
WEBP

WEBP

Image Files
Google Web Picture

Modern image format providing superior lossy and lossless web compression.

File Size Preset: 10KB50MB
SVG

SVG

Image Files
Scalable Vector Graphics

XML-based vector graphic format supporting high-resolution scaling.

File Size Preset: 1KB5MB
GIF

GIF

Image Files
Graphics Interchange Format

Raster image format supporting standard 256-color palettes and looping animations.

File Size Preset: 10KB10MB
BMP

BMP

Image Files
Bitmap Image File

Uncompressed raw raster image standard developed for Windows environments.

File Size Preset: 10KB50MB
TIFF

TIFF

Image Files
Tagged Image File Format

High-quality lossless graphic standard popular in publishing and photography.

File Size Preset: 10KB100MB
ICO

ICO

Image Files
Windows Icon Format

Icon file format storing multiple pixel sizes and transparency levels.

File Size Preset: 1KB1MB
AVIF

AVIF

Image Files
AV1 Image File Format

Next-generation image format with superior compression using AV1 video codec intra-frames.

File Size Preset: 10KB50MB
HEIC

HEIC

Image Files
High Efficiency Image Container

Apple's default photo format using HEVC compression for smaller file sizes than JPEG.

File Size Preset: 10KB50MB
HTML

HTML

Code & Data
HyperText Markup Language

The structural skeleton standard of all web documents.

File Size Preset: 1KB10MB
CSS

CSS

Code & Data
Cascading Style Sheets

Style declaration language used to format web layouts and design systems.

File Size Preset: 1KB5MB
JS

JS

Code & Data
JavaScript File

High-level dynamic scripting language of the web platform.

File Size Preset: 1KB10MB
TS

TS

Code & Data
TypeScript File

Statically typed superset of JavaScript compiling down to standard JS.

File Size Preset: 1KB5MB
JSON

JSON

Code & Data
JavaScript Object Notation

Ubiquitous lightweight human-readable structured data exchange format.

File Size Preset: 1KB100MB
XML

XML

Code & Data
Extensible Markup Language

Flexible, hierarchical tag markup system for data storage and custom schemas.

File Size Preset: 1KB10MB
YAML

YAML

Code & Data
YAML Ain't Markup Language

Minimalist indentation-based serialization standard for configuration files.

File Size Preset: 1KB5MB
CSV

CSV

Code & Data
Comma-Separated Values

Simple text standard representing tabular datasets separated by comma delimiters.

File Size Preset: 1KB100MB
TSV

TSV

Code & Data
Tab-Separated Values

Tab-delimited structured raw text format for tabular spreadsheet data.

File Size Preset: 1KB10MB
SQL

SQL

Code & Data
Structured Query Language

Database queries, schema definitions, and table inserts in plain SQL format.

File Size Preset: 1KB50MB
PHP

PHP

Code & Data
Hypertext Preprocessor (PHP)

Server-side template-driven scripting language for dynamic web pages.

File Size Preset: 1KB5MB
PY

PY

Code & Data
Python Script

General-purpose scripting and high-level programming language code file.

File Size Preset: 1KB5MB
SH

SH

Code & Data
Bash Shell Script

Linux/Unix executable shell commands and automation script.

File Size Preset: 1KB1MB
ICS

ICS

Code & Data
iCalendar Event File

Universal calendar data exchange format for events, meetings, and scheduling across all calendar apps.

File Size Preset: 1KB1MB
EML

EML

Code & Data
Email Message File

Standard RFC 822 email message format used by Outlook, Apple Mail, and Thunderbird.

File Size Preset: 1KB5MB
ZIP

ZIP

Archives & Compressed
ZIP Compressed Archive

Standard directory compression container package supported natively.

File Size Preset: 10KB100MB
RAR

RAR

Archives & Compressed
Roshal Archive (RAR)

Proprietary high-efficiency archive format widely used for multi-part files.

File Size Preset: 10KB100MB
7Z

7Z

Archives & Compressed
7-Zip Compressed Archive

High-ratio open-source compression format using LZMA algorithms.

File Size Preset: 10KB100MB
BZ2

BZ2

Archives & Compressed
Bzip2 Compressed Archive

High-quality single-file compression container format using the Burrows-Wheeler algorithm.

File Size Preset: 10KB100MB
TAR

TAR

Archives & Compressed
Consolidated Tape Archive (TAR)

Standard UNIX sequential archive format packaging multiple files without compression.

File Size Preset: 10KB100MB
GZ

GZ

Archives & Compressed
GZIP Compressed File

Standard Unix compression format using the DEFLATE algorithm.

File Size Preset: 10KB50MB
MP4

MP4

Video Files
MPEG-4 Part 14 Video

Modern standard video container using H.264 / H.265 audio-video codecs.

File Size Preset: 100KB100MB
MOV

MOV

Video Files
Apple QuickTime Movie

Common multimedia file wrapper standard developed by Apple.

File Size Preset: 100KB100MB
WEBM

WEBM

Video Files
Web Media File (WebM)

Open-source web video container using VP8/VP9/AV1 video codecs.

File Size Preset: 100KB100MB
MKV

MKV

Video Files
Matroska Video Container

Highly flexible video file packaging infinite subtitle, audio, and video tracks.

File Size Preset: 100KB100MB
AVI

AVI

Video Files
Audio Video Interleave

Legacy multimedia container format developed by Microsoft in 1992.

File Size Preset: 100KB100MB
3GP

3GP

Video Files
3GPP Mobile Video

Multimedia container format designed for mobile phones and 3G network video streaming.

File Size Preset: 100KB50MB
MP3

MP3

Audio Files
MPEG-1 Audio Layer III

Ubiquitous digital audio standard utilizing lossy audio compression algorithms.

File Size Preset: 10KB50MB
WAV

WAV

Audio Files
Waveform Audio File

Uncompressed raw audio wave format containing high-fidelity PCM audio blocks.

File Size Preset: 10KB100MB
M4A

M4A

Audio Files
MPEG-4 Audio File

Lossy compressed audio file container popular on Apple systems and standard players.

File Size Preset: 10KB50MB
OGG

OGG

Audio Files
Ogg Vorbis Audio

Patent-free lossy compression audio container format developed by Xiph.Org.

File Size Preset: 10KB50MB
FLAC

FLAC

Audio Files
Free Lossless Audio Codec

Lossless compression audio standard preserving exact original waveform details.

File Size Preset: 10KB100MB
AAC

AAC

Audio Files
Advanced Audio Coding

Modern lossy audio compression standard providing better quality than MP3 at the same bitrate.

File Size Preset: 10KB50MB
EXE

EXE

Executables & System
Windows Executable Program

Standard binary executable utility containing PE (Portable Executable) code block.

File Size Preset: 10KB100MB
ISO

ISO

Executables & System
Disk Image (ISO-9660)

Exact sector-by-sector replication archive of physical optical disc structures.

File Size Preset: 1MB100MB
DMG

DMG

Executables & System
Apple Disk Image

UDIF file system container standard utilized by macOS for package distribution.

File Size Preset: 1MB100MB
JAR

JAR

Executables & System
Java Executable Archive

Compressed program wrapper package containing Java classes, resources, and metadata.

File Size Preset: 10KB50MB
APK

APK

Executables & System
Android Package Installer

Application package file format utilized by the Android OS for mobile app distribution.

File Size Preset: 100KB100MB
BAT

BAT

Executables & System
Windows Batch Script

Command script containing a sequence of system actions executed by cmd.exe.

File Size Preset: 1KB100KB