Does Subformer upload my file to a server?

No. Every conversion runs entirely in your browser. Your file never leaves your device - no upload, no server processing, no tracking of the file content.

Which formats can I convert?

Video: MP4, MOV, MKV, WebM. Audio: MP3, WAV, OGG, AAC, M4A. Images: JPG, PNG, WebP, HEIC, BMP, GIF. Documents: PDF (input and output). Most common audio codecs (AAC, MP3, Opus, Vorbis, FLAC, PCM) are accepted as media input.

Can I combine JPGs into a PDF?

Yes. Drop one or more JPG or PNG files and pick PDF as the output - each image becomes a page in a single PDF. We embed the original image bytes without re-encoding, so there's no quality loss.

Can I convert HEIC photos from my iPhone?

Yes. Pick HEIC to JPG, HEIC to PNG, or HEIC to PDF. The converter uses a WebAssembly decoder to read HEIC locally - your photos never leave your device.

Can I convert MP4 to MP3?

Yes. Pick an MP4 (or any video file) and choose MP3 as the output. The converter extracts and re-encodes the audio track locally.

Can I convert MOV to MP4?

Yes - and it's fast. MOV and MP4 share the same underlying container, so most MOV to MP4 conversions are remuxes without re-encoding video.

Is there a file size limit?

No server-side limit - nothing is uploaded. Files over 500 MB trigger a warning because browsers can run out of memory on very large files.

Which browsers are supported?

Any modern browser: Chrome 94+, Edge 94+, Firefox 130+, Safari 16.4+. Image and PDF conversions also need WebAssembly support, which every modern browser has.

Can I convert multiple files at once?

For image-to-PDF, yes - drop several images and we combine them into a single PDF. For other conversions, batch is on the roadmap. You can open multiple browser tabs in parallel as a workaround.

What's the difference between the WebCodecs and FFmpeg engines?

Both engines (used for video and audio) run entirely in your browser - no file is ever uploaded. WebCodecs is the default: it uses your browser's hardware-accelerated media APIs so conversions are fast and ship no extra wasm. FFmpeg (wasm) is a pure-software fallback built from the same ffmpeg project desktop tools use - it supports more codecs but is slower and downloads ~22 MB on first use.

When should I pick the FFmpeg engine?

Switch to FFmpeg if the WebCodecs engine fails with an 'unsupported codec' error, if your browser lacks a decoder (e.g. older Safari with VP9), or if you need strict H.264 + AAC output for maximum device compatibility. For everyday MP4 / MOV / MKV / WebM / MP3 / WAV conversions, WebCodecs is faster and recommended.

Is FFmpeg-wasm safe to run in the browser?

Yes. @ffmpeg/ffmpeg is an open-source WebAssembly build of the official FFmpeg project. It runs inside the browser sandbox with no network access - all processing happens on your device. We fetch the wasm core once from a public CDN and execute it locally.

Subformer

Mlebu

Gratis · Tanpa daftar · Mlaku ing browser sampeyan

Konverter File Online Gratis

Ngonversi video, audio, gambar, lan PDF sakabehé ing panyunggingmu - MP4, MOV, MP3, WAV, JPG, PNG, HEIC, PDF, lan liya-liyane. Cepet, pribadi, ora ana sing diunggah.

Seret siji utawa luwih - video, audio, gambar, PDF, subtitle, data, dokumen. Target saben file, konversi batch, undhuh ZIP.

Pilih kategori kanggo miwiti

Saben konversi nduwèni kaca khusus karo tips sing khusus kanggo format. Pilih sing paling cocog karo kabutuhanmu.

Carane ngonversi file online

01
Lepas file sampeyan
Seret video, audio, gambar, utawa PDF menyang konverter - utawa klik kanggo milih siji saka piranti sampeyan.
02
Pilih format output
Pilih preset siji-klik utawa buka kaca konversi khusus (JPG dadi PDF, HEIC dadi JPG, MP4 dadi MP3, lan liya-liyané).
03
Konversi lan unduh
Klik Convert. Browser sing bakal ngurus liyane - delengen bar kemajuan, banjur unduh file anyar sampeyan.

Kabeh sing sampeyan butuhake kanggo ngonversi file

Privasi minangka desain

File sampeyan ora tau ninggalake piranti. Dekoding, enkoding, lan nulis kabeh kelakon ing browser sampeyan - kita malah ora bisa ndeleng jeneng file.

Diakselerasi hardware

Video lan audio liwat WebCodecs - mesin sing padha karo sing digunakake browser sampeyan kanggo YouTube lan Netflix. Aliran gambar lan PDF nggunakake API kanvas, uga ramah GPU.

Dhukungan Gambar & PDF

Gabungaké JPG dadi PDF, konversi foto HEIC saka iPhone sampeyan, render kaca PDF dadi gambar, utawa pindhah antarane JPG, PNG, lan WebP.

Ekstraksi video ↔ audio

Unggah video, pilih format audio, lan entuk mung audioné. Apik kanggo ngowahi omongan, kuliah, lan podcast dadi MP3.

MP4 fast-start

Output MP4 diprodhuksi kanthi moov atom ing wiwitan file - cocok kanggo streaming lan playback web langsung.

Tanpa instalasi

Ora ana aplikasi desktop, ora ana plugin, ora ana ffmpeg baris-perintah. Bukak kaca, seret file, entuk asil.

Batal kapan wae

Konversi mlaku ing latar tab lan bisa dibatalake ing tengah proses yen sampeyan owah pikiran.

Format sing didhukung

Konverter maca akèh jinis file umum lan ngekspor menyang salah siji format ing ngisor iki.

Video

MP4 - Wadah sing paling kompatibel. Bisa digunakake ing endi wae. Digawe karo fast-start supaya pemutaran web cepet.
MOV - Kontainer QuickTime. Strukturé padha karo MP4 - remuxing cepet.
MKV - Matroska. Kontainer fleksibel sing digunakake dening akeh sumber.
WebM - Format asli web, cocok kanggo video online karo VP8 / VP9 / AV1.

Audio

MP3 - Didhukung sacara universal. Pilihan apik kanggo podcast lan nuduhake musik.
M4A / AAC - Audio AAC ing kontainer MP4 (M4A) utawa aliran ADTS mentah. Umum ing piranti Apple.
WAV - Audio PCM tanpa kompresi. Apik kanggo alur kerja suntingan.
OGG - Wadah sumber terbuka, biasane nganggo audio Opus utawa Vorbis.

Gambar

JPG - Format lossy dominan ing web. File cilik, dhukungan meh universal, ora ana transparansi.
PNG - Tanpa kehilangan data kanthi transparansi saluran alfa. Paling cocog kanggo tangkapan layar, logo, lan grafis.
WebP - Format modern saka Google. Luwih cilik ukuran file tinimbang JPG lan PNG ing kualitas sing padha.
HEIC - Format foto iPhone standar Apple. Ukurane kira-kira setengah saka JPG - kita dekode kanthi lokal liwat WebAssembly.

Dokumen

PDF - Format dokumen universal. Semataké gambar JPG / PNG / HEIC menyang siji PDF, utawa render kaca PDF bali dadi gambar. PDF multi-halaman metu minangka ZIP saka kaca-kaca.

Teks & Subtitle

TXT / Markdown - Teks polos lan Markdown. Konversi menyang PDF kanggo distribusi cetak. Judhul, daftar, lan bullet Markdown ditampilake nganggo gaya dasar.
SRT / VTT - File subtitle lan caption. Konversi antarane SRT lan WebVTT, utawa mbusak timestamp kanggo entuk transkrip teks polos.

Data & Lembar Kerja

CSV / JSON / YAML - Format data tabular lan terstruktur. Konversi antarané loro format apa wae kanggo skrip, API, lan file konfigurasi.
XLSX (Excel) - Spreadsheet Excel. Ekstrak data dadi CSV utawa JSON kanggo scripting lan pipeline data.

Kabeh konversi

Kaca siji-klik khusus kanthi pandhuan sing spesifik kanggo saben format konversi sing didhukung.

Video & Audio

Gambar & PDF

Teks & Subtitle

Data & Lembar Kerja

Dokumen

Kompres

Ing njero

Konverter minangka kaca statis ditambah kode sisih klien. Sawise dimuat, ora ana server ing puteran, mula ora ana watesan unggah, ora ana antrean, lan ora ana akun.

WebCodecs: Mesin video lan audio standar. Iki nangani enkoding lan dekoding menyang pipa hardware sing padha karo sing digunakake browser sampeyan kanggo muter YouTube, mula konversi mlaku kanthi kacepetan asli lan ora ngirim unduhan tambahan.
WebAssembly: Mesin fallback piranti lunak, dikompilasi menyang WebAssembly lan mlaku ing sandbox browser. Iki luwih alon tinimbang jalur hardware lan diundhuh sepisan nalika digunakake pisanan, nanging nutupi codec sing ditolak browser sampeyan kanthi asli.
Container remuxing: Nalika mung wadhah sing owah, aliran ing njero disalin tinimbang dienkode ulang. Konversi kasebut rampung ing sawetara detik tanpa mundhut kualitas.
Client-side PDF engine: Mbangun PDF saka gambar, nampilake kaca menyang JPG utawa PNG, lan njupuk teks saka dokumen kabeh mlaku ing tab sampeyan. Ora ana kaca sing dikirim menyang ngendi wae kanggo ditampilake.
WebAssembly image decoding: Foto HEIC lan HEIF saka iPhone didekode kanthi lokal. Browser ora ngirim dekoder asli kanggo format kasebut, saengga modul WebAssembly ngisi celah ing piranti sampeyan tinimbang masrahake foto menyang server.
Canvas 2D and in-browser packaging: Re-encoding gambar liwat encoder kanvas browser dhewe, lan asil multi-file dikemas menyang ZIP ing memori supaya batch diundhuh minangka siji file.

Pilih kategori kanggo miwiti

Video

Audio

Gambar

PDF & Dokumen

Teks & Subtitle

Data & Lembar Kerja

Carane ngonversi file online

Lepas file sampeyan

Pilih format output

Konversi lan unduh

Kabeh sing sampeyan butuhake kanggo ngonversi file

Privasi minangka desain

Diakselerasi hardware

Dhukungan Gambar & PDF

Ekstraksi video ↔ audio

MP4 fast-start

Tanpa instalasi

Batal kapan wae

Format sing didhukung

Video

Audio

Gambar

Dokumen

Teks & Subtitle

Data & Lembar Kerja

Kabeh konversi

Video & Audio

Gambar & PDF

Teks & Subtitle

Data & Lembar Kerja

Dokumen

Kompres

Ing njero

Pitakon sing asring ditakoni

Apa Subformer ngunggah fileku menyang server?

Format apa sing bisa diconversi?

Apa aku bisa nggabungaké JPG dadi PDF?

Apa aku bisa ngkonversi foto HEIC saka iPhone aku?

Apa aku bisa ngonversi MP4 dadi MP3?

Apa aku bisa ngonversi MOV dadi MP4?

Apa ana wates ukuran file?

Napa konversi MP3 sing kaping pisan mbutuhake wektu sawetara ing Firefox?

Browser apa sing didhukung?

Apa aku bisa ngonversi sawetara file sekaligus?

Apa bedane antarane mesin WebCodecs lan FFmpeg?

Kapan panjenengan kudu milih mesin FFmpeg?

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Puter Gambar

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