300 formats documented

Every file type, explained and opened

One page per extension: what the format actually is, who made it, what its magic bytes look like, and how to open it free in your browser with nothing uploaded anywhere. Start with the letter your extension begins with.

0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Browse by category

Code

67 formats

.asm .asp .aspx .bash .bat .c .cfg .cjs .class .cmd

Binary & system

34 formats

.accdb .accde .accdt .acsm .azw .azw3 .bak .bin .cdr .cr3

3D & CAD

22 formats

.3dm .3ds .3mf .blend .dae .dwg .dxf .fbx .gcode .glb

Images

20 formats

.arw .avif .bmp .cr2 .cur .dng .dpx .gif .heic .heif

Video

18 formats

.3gp .asf .avi .f4v .flv .h264 .m2ts .m4v .mkv .mov

Audio

18 formats

.aac .aiff .caf .dsf .dts .flac .m4a .m4b .m4r .mid

Text & markup

17 formats

.cer .crt .csr .dat .fits .key .log .lrc .m3u .m3u8

Spreadsheets & data

12 formats

.csv .dbf .ods .qif .tsv .xlam .xls .xlsb .xlsm .xlsx

Documents

9 formats

.docm .docx .dotm .dotx .odt .pages .pdf .wpd .wps

Fonts

7 formats

.eot .fnt .fon .otf .ttf .woff .woff2

Data & config

6 formats

.geojson .har .json .jsonl .map .webmanifest

Presentations

6 formats

.odp .potx .ppsx .pptm .pptx .sldx

Vector graphics

5 formats

.ai .eps .ps .svg .svgz

Email & contacts

5 formats

.eml .ics .mbox .msg .vcf

Databases

4 formats

.db .pdb .sqlite .sqlite3

Design files

2 formats

.psb .psd

Notebooks

1 formats

.ipynb

Metadata

1 formats

.torrent

Browse A-Z

0-9

.001 .3dm .3ds .3gp .3mf .7z

A

.aac .accdb .accde .accdt .ace .acsm .ai .aiff .apk .appimage .ar .arj .arw .asf .asm .asp .aspx .avi .avif .azw .azw3

B

.bak .bash .bat .bin .blend .bmp .bz .bz2

C

.c .cab .caf .cbr .cbz .cdr .cer .cfg .cjs .class .cmd .coffee .conf .cpio .cpp .cr2 .cr3 .crdownload .crt .crx .cs .csh .cshtml .csr .css .csv .cur

D

.dae .dart .dat .db .dbf .deb .djvu .dll .dmg .dmp .dng .doc .docm .docx .dotm .dotx .dpx .dsf .dts .dwg .dxf

E

.eml .env .eot .eps .epub .exe

F

.f4v .fbx .fits .fla .flac .flv .fnt .fon

G

.gcode .geojson .gif .glb .gltf .go .gradle .gz

H

.h .h264 .har .heic .heif .hpp .htm .html

I

.ico .ics .ini .ipa .ipynb .iso

J

.jar .java .jfif .jpeg .jpg .js .json .jsonl .jsp .jsx

K

.key .kml .kmz .kt

L

.less .lnk .log .lrc .lrf .lua .lzh

M

.m2ts .m3u .m3u8 .m4a .m4b .m4r .m4v .map .max .mbox .md .mdb .mdx .mid .midi .mjs .mkv .mobi .mov .mp2 .mp3 .mp4 .mpeg .mpg .mpp .msg .msi .mtl

N

.nef .nfo .nrg

O

.obj .odp .ods .odt .oga .ogg .ogv .one .opus .otf

P

.pages .pak .pas .pcx .pdb .pdf .pem .php .pkg .pkl .pkpass .pl .plist .ply .png .potx .ppsx .ppt .pptm .pptx .prproj .ps .ps1 .psb .psd .pub .py .pyc

Q

.qbw .qif .qt

R

.r .rar .rb .reg .rpm .rs .rss .rtf .rvt

S

.sass .scss .sh .skp .sldx .sql .sqlite .sqlite3 .srt .step .stl .stp .svelte .svg .svgz .swift .sys

T

.tar .tex .texi .tgz .tif .tiff .tmp .toml .torrent .ts .tsv .tsx .ttf .txt

U

.u3d .usdz

V

.vb .vbs .vcf .vhd .vhdx .vmdk .vob .vsd .vsdx .vtt .vue

W

.war .wav .webm .webmanifest .webp .wim .wma .wmv .woff .woff2 .wpd .wps

X

.xcf .xhtml .xlam .xls .xlsb .xlsm .xlsx .xltm .xltx .xmind .xml .xpi .xps .xsd .xsl .xz

Y

.yaml .yml

Z

.z01 .zip .zipx .zsh .zst

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