A little clarity for every file.

What’s this file?
Find your next step.

Find what an extension means, how to open it, and what to try when it doesn’t work.

Extension or filename

Dot optional / Full filenames are OK / Case-insensitive

Try

No file upload. Names are matched in your browser.

411 file extensions411 in-depth guidesSources you can check

FIND YOUR WAY

Start with what you want to do.

Practical steps first. The details are there when you need them.

Browse all extensions

Open an iPhone photo

Open HEIC and export JPEG

Open or convert a PDF

View PDF and export an image

Fix a CSV import

Keep encoding and leading zeros

Unpack a ZIP archive

Check extraction and passwords

Get a video to play

Check format and codec support

Identify an unknown file

Trace a DAT file to its producer

Load a local AI model

Find a workflow for GGUF

Use AI tensor weights

Check Safetensors support

COMPARE FORMATS

Compare file formats

Find the relevant format and instructions for your device and purpose.

Compare two file formats

CATEGORY

Browse by category

📊 Spreadsheets (11)

+

.xlsExcel Workbook (legacy).xlsxExcel Workbook .xlsmExcel Macro-Enabled Workbook .csvCSV Data .odsOpenDocument Spreadsheet .numbersApple Numbers Document .xlsbExcel binary workbook .xlamExcel macro-enabled add-in .xltxExcel workbook template .tsvTab-Separated Values .xltmExcel Macro-Enabled Template

🖥️ Presentations (9)

+

.pptPowerPoint (legacy).pptxPowerPoint Presentation .odpOpenDocument Presentation .potxPowerPoint template .ppsxPowerPoint Show .ppsmPowerPoint Macro-Enabled Show .potmPowerPoint Macro-Enabled Template .ppamPowerPoint Add-in .thmxOffice Theme

❓ Generic / Ambiguous Data (13)

+

.keyKEY File (Keynote / Private Key).savSAV File (Game Save / SPSS Data).datGeneric DAT Data .binGeneric Binary Data .xpsXPS Document .m3u8M3U8 Playlist .torrentBitTorrent Metadata .pstOutlook Data File .ostOutlook Offline Data File .oftOutlook Template .dmpCrash or memory dump .sha256SHA-256 Checksum List .sfvSimple File Verification List

🗜️ Archives (17)

+

.zipZIP Archive .rarRAR Archive .7z7-Zip Archive .tarTAR Archive .tar.gztar.gz Archive .gzGzip Archive .bz2Bzip2 Archive .xzXZ Archive .cabWindows cabinet .cpioCPIO Archive .lz4LZ4 Compressed Data .zstZstandard Compressed Data .001First Split Volume or Numbered Data .r00Legacy RAR Volume .zipxExtended-compression ZIP Archive .tgzGzip-compressed Tar Archive .lzhLHA / LHarc Archive

✉️ Email & Calendar (7)

+

.emlEmail Message .msgOutlook Message .icsCalendar Event .vcfvCard Contact .mboxMbox Mailbox .emlxApple Mail Message .olmOutlook for Mac Archive

📚 eBooks (5)

+

.epubEPUB eBook .mobiMOBI eBook .azw3Kindle eBook .cbzZIP .cbrRAR

🔤 Fonts (4)

+

.ttfTrueType Font .otfOpenType Font .woffWeb Open Font .woff2Web Open Font 2

💾 Disk & Database (12)

+

.isoISO .img.img file .dbData .sqliteSQLite Data .mdbAccess Data（）.accdbAccess Data .dbfDBF data table .esdWindows ESD Image .kdbxKeePass Encrypted Database .wimWindows Imaging File .qbbQuickBooks Backup .qbwQuickBooks Company File

💬 Subtitles & Captions (8)

+

.srtSubRip Subtitle .vttWebVTT Subtitle .assASS Subtitle .ssaSSA Subtitle .subSUB Subtitle .lrcLRC Lyrics .smiSAMI Subtitle .supPGS Subtitle

⏳ Temporary & Downloads (8)

+

.crdownloadChrome Partial Download .partPartial Download .partialPartial Download .downloadDownload-in-Progress File .tmpTemporary File .tempTemporary File .swpSwap File .bakBackup File

🎨 Creative Projects (38)

+

.prprojPremiere Pro Project .aepAfter Effects Project .aepxAfter Effects XML Project .aetAfter Effects Project Template .inddInDesign Document .idmlInDesign Markup .drpDaVinci Resolve Project .fcpxmlFinal Cut Pro XML .clipCLIP STUDIO PAINT File .cmcCLIP STUDIO Multi-page File .afphotoAffinity Photo Document .afdesignAffinity Designer Document .xcfGIMP Image Project .kraKrita Document .blend1Blender Backup .psbPhotoshop large document .inxLegacy InDesign interchange .acoPhotoshop color swatches .abrPhotoshop brushes .patImage patterns or CAD hatches .aseColor exchange or Aseprite document .aup3Audacity project .bandGarageBand project .logicxLogic Pro project .flpFL Studio project .alsAbleton Live Set .afpubAffinity Publisher Document .cdrCorelDRAW Drawing .figFIG Design or Figure File .sketchSketch Design Document .xdAdobe XD Design Document .drawiodraw.io Diagram .rppREAPER Project .sesxAudition Multitrack Session .aafAdvanced Authoring Format .omfOpen Media Framework Interchange .vegVEGAS Pro Project .slaScribus Layout Document

🔬 Data & Science (17)

+

.parquetApache Parquet Data .featherFeather Data .arrowApache Arrow Data .matMATLAB Data .rdsR Serialized Data .rdataR Workspace .dtaStata Data .ncNetCDF Data .fitsFITS Astronomical Data .h5adAnnData Dataset .ipynbJupyter Notebook .jsonlJSON Lines Data .niiNIfTI Image Data .qboQuickBooks Web Connect Transactions .ofxOpen Financial Exchange Data .qfxQuicken Web Connect File .rmdR Markdown Document

☁️ Cloud & Shortcuts (6)

+

.gdocGoogle Docs Shortcut .gsheetGoogle Sheets Shortcut .gslidesGoogle Slides Shortcut .lnkWindows Shortcut .urlInternet Shortcut .weblocmacOS Web Location

🖥️ Virtual Machines (9)

+

.vmdkVMware Virtual Disk .vdiVirtualBox Virtual Disk .ovaOpen Virtual Appliance .ovfOpen Virtualization Format .qcow2QEMU QCOW2 Disk .vhdVirtual Hard Disk .vhdxVirtual Hard Disk v2 .vboxVirtualBox Machine Settings .vmxVMware VM Configuration

📷 Photo Sidecars & Camera (6)

+

.aaeApple Photos Edit Sidecar .xmpXMP Metadata Sidecar .iccICC Color Profile .icmICM Color Profile .lrcatLightroom Catalog .dcpDNG Camera Profile

🔐 Certificates & Keys (12)

+

.pemPEM Certificate / Key .crtCertificate File .cerCertificate File .derDER Certificate .p12PKCS#12 Certificate Bundle .pfxPFX Certificate Bundle .csrCertificate Signing Request .p7bPKCS#7 Certificate Bundle .p7sS/MIME Signature .gpgOpenPGP Encrypted or Signed Data .p7mCMS Signed or Encrypted Container .ascASCII Armor and Other Text Data

🎮 Games & Saves (6)

+

.pakGame Package .wadWAD Game Data .romROM Image .mcworldMinecraft World .mcpackMinecraft Pack .nbtMinecraft tag data

GUIDE

What is a file extension?

The suffix that identifies a file type

For example, .jpg in photo.jpg.

Renaming is not conversion

Changing .heic to .jpg does not convert the file.

Executables and model files need care

Verify the source before running or loading unknown files.