IrfanView is a is a fast and simple freeware image viewer, editor and converter that supports all major graphic formats, including AIF, ANI/CUR, ASF, AU/SND/AIF, AVI, B3D, BMP/DIB, CAM, CLP, CRW, DAT (VideoCD), DCR, DDS, DXF, Dicom/ACR, DJVU, ECW, EMF/WMF, EPS, FLI/FLC, FPX, FSH, G3, GIF, ICO/ICL/EXE/DLL, IFF/LBM, IMG/GEM, JPG2000, JPG/JPEG, JPM, KDC, LDF, LWF, MED, MID/MIDI/RMI, MNG/JNG, MOV, MP3, MPG/MPEG, MrSID, MRW, NEF, LM/NOL/NGG, OGG, ORF, PBM/PGM/PPM, PCX/DCX, PhotoCD, Mac PICT, PNG, PSD, PSP, QTIF, RAS/SUN, RAW, RAF, RA, RLE, SFF, SFW, SGI/RGB, SWF, TGA, TIF, TTF, TXT, WAD, WAV, WBMP, WBZ/WBC, WMA, WMV, XBM and XPM. In addition it features drag and drop support, directory viewing, TWAIN (Technology Without An Interesting Name) scan support, slide shows, batch conversion, multi language support, thumbnail option, preview option, print option, IPTC edit, capturing, extract icons from EXE/DLL/ICLs, lossless JPG (Joint Photographic Expert Group) rotation, EXE/SCR creating, many hotkeys, many command line options and modifications such as changing color depth, crop, blur and sharpen.

IrfanView 堪與 AcdSee 媲美，支持的圖像、音頻、視頻格式眾多，并可幻燈顯示、批量轉換格式、批量重命名、JPG 無損旋轉，支持拖放操作；亦具有調整圖像大小、調整顏色深度、添加覆蓋文字、特效（內置）處理等圖像編輯功能，3.85 版已能支持使用 Adobe Photoshop 的濾鏡（8BF 格式）；還可以制作 HTML 格式的縮略圖目錄、創(chuàng)建自播放幻燈顯示（EXE 或 SCR），是圖像愛好者必備的袖珍精品。 

IrfanView 能打開的圖像、音頻、視頻格式有: AIF、ANI/CUR、 ASF、AU/SND、AVI、B3D、BMP/DIB、CAM (Casio JPG)、CLP、DDS、 Dicom/ACR、DJVU、ECW、EMF/WMF、EPS、FlashPix (FPX)、FSH、 G3、 GIF、ICO/ICL/EXE/DLL、IFF/LBM、IMG (GEM)、JPG2000、JPG、JPM、 KDC、LDF、LWF、MED、MID/RMI、MNG/JNG、MOV、MP3、MPG、MrSID、 NLM/NOL/NGG、OGG、PBM/PGM/PPM、PCX/DCX、PhotoCD、PNG、PSD、PSP、 RAS/SUN、RAW、Real Audio (RA)、RLE、SFF、SFW、SGI/RGB、 SWF (Flash/Shockwave)、TGA、TIF、TTF、TXT、WAD、WAV、WBMP、 WBZ/WBC、XBM、XPM、CRW、NEF、ORF、RAF、MRW、DCR、DXF 等等。