AAC Converter, Convert Audio to AAC Online, In Your Browser
Drop a WAV, MP3, M4A, OGG or FLAC file and get a compact, high-efficiency AAC, the codec that sounds cleaner than MP3 at the same bitrate and plays natively across Apple, Android and streaming. Waveform preview, exact before/after size, all in your browser, never uploaded.
What is the aac converter?
The AAC Converter encodes audio into AAC (Advanced Audio Coding), the MP3 successor that sounds cleaner at the same bitrate and plays natively on iPhone, Android, YouTube and video apps. It decodes WAV, MP3, M4A, OGG or FLAC with the Web Audio API, previews the waveform, then writes a compact .aac file locally in your browser. Nothing is uploaded.
The GigAI AAC Converter turns almost any audio your browser can decode into AAC, Advanced Audio Coding, the codec that succeeded MP3 and delivers noticeably better quality at the same bitrate. It's what iTunes, Apple Music, YouTube and virtually every modern video container reach for, so an.aac (or AAC-in-M4A) file is the safe choice when you want small size without the dated sound of low-bitrate MP3. Everything happens on your device: your file is decoded with the Web Audio API into a lossless intermediate, and only then does an on-demand codec (the shared ffmpeg core) load to encode the AAC. That codec is fetched once per session and only when you actually convert, so the page itself stays light. You drop a file and immediately see its waveform, duration, sample rate and channels, so you're encoding the right source at the right settings rather than guessing. When it finishes you get the exact original and AAC byte sizes side by side, the real delivery weight of the result, not a vague 'optimized' claim. Because nothing is uploaded, sensitive material (an interview, a rough mix, a confidential voice note) never leaves the tab. Be honest about the format: AAC is lossy, so converting an already-compressed source like MP3 decodes and re-encodes, which can only lose a hair more, never recover detail. When you start from a lossless WAV or FLAC you get AAC at its best. This is the tool you want when you need audio that's small, modern-sounding and ready for Apple, Android and video pipelines. Close the tab and every byte is gone.
- Difficulty:
- Medium
- Typical time:
- ~30s
- Processing:
- 100% browser processing
Last updated
How to use the aac converter
- 1
Drop your audio
Drag a WAV, MP3, M4A, OGG, FLAC or other decodable file onto the workspace, or click to browse. It's read locally and you'll see its waveform, duration and channels immediately.
- 2
Convert to AAC
Press Convert to AAC. The first time in a session an on-demand codec loads, then a progress bar tracks the encode on your device: quick for short clips, longer for big lossless sources.
- 3
Check the size & download
Read the original vs AAC size to see exactly what changed, then download your.aac file, or reset and drop another file without reloading the page.
What AAC Converter includes
Encode to modern, efficient AAC
AAC sounds cleaner than MP3 at the same bitrate and is the audio codec behind Apple Music, YouTube and most video files. Convert once and get a small, modern-sounding file the whole ecosystem understands.
Waveform preview before you commit
The moment you drop a file you see its waveform plus duration, sample rate and channels, so you're encoding the right source at the right settings instead of converting blind.
Exact before / after size
When it finishes you get the original bytes and the AAC bytes side by side, the real delivery weight of the result, not a vague badge that hides what actually changed.
On-demand codec, page stays light
The AAC encoder loads only when you actually convert, once per session. Nothing heavy downloads just for opening the page, and the conversion still runs entirely on your device.
Plays natively on Apple & Android
AAC is a first-class citizen on iPhone, iPad, Mac, Android and modern browsers. No extra player, no codec pack, no 'unsupported format' surprise when you hand the file off.
100% private, nothing uploaded
Decoding and encoding happen in your browser. Interviews, rough mixes and voice notes are never uploaded, stored or logged, there's no upload bar and no cloud copy of your audio.
Why use our aac converter
Better quality per kilobyte than MP3
AAC's encoder is more efficient, so at any given bitrate it generally sounds closer to the source than MP3. You keep more of the music (or the clarity of speech) for the same file size.
The right format for Apple and video
Apple's ecosystem and most video containers default to AAC. Deliver AAC and your audio drops straight in. No transcode step downstream, no compatibility grumbling from an editor or player.
Small files without the dated sound
When you need audio small enough to attach, stream or bundle, AAC hits a smaller size than a comparable-quality MP3, ideal for uploads, app assets and anything bandwidth-conscious.
No upload wait, no privacy tradeoff
Server converters make you upload first and trust them with the file. Here the audio never leaves your browser, so there's no upload bar and nothing to hand a stranger with a private recording.
Built for the way you work
From quick one-off fixes to daily workflows, see how people put this tool to use.
- Apple-ecosystem user
Make an AAC that just works on iPhone and Mac
You need audio that lands cleanly in Apple Music, Voice Memos or a Keynote without a transcode warning. Convert your source to AAC and it plays natively across every Apple device.
- Video creator / Editor
Prep an AAC audio track for a video pipeline
Most video containers expect AAC audio. Encode your voiceover or music bed to AAC first so it drops straight into your editor or muxer without an extra conversion step.
- Anyone sending audio
Shrink audio smaller than MP3 at the same quality
A heavy WAV or FLAC won't fit an upload or attachment. AAC gets it smaller than a comparable MP3 while keeping speech and music clean, a better small-file trade for modern targets.
- Privacy-conscious user
Convert a private recording locally
An interview, a rough demo or a confidential voice note shouldn't be uploaded to a stranger's converter. Do it entirely in your browser so the audio never leaves the device.
Supported formats
Accepts WAV, MP3, M4A, AAC and OGG, and produces AAC, all processed locally in your browser.
- WAV
- MP3
- M4A
- AAC
- OGG
- FLAC
- WEBM
- AAC
Frequently asked questions
Recommended tools
MP3 Converter
Convert any audio to MP3 in your browser, WAV, M4A, AAC, OGG, FLAC and more to a clean, universally-playable MP3 with a bitrate you choose. Preview the waveform, encode locally with lamejs, then download. Nothing is uploaded.
Audio Trimmer
Trim audio in your browser with a real waveform: drop an MP3, WAV, M4A or OGG, drag a selection to keep exactly the part you want, preview it, then download a lossless WAV or a compact MP3. Sample-accurate and 100% private. Nothing is uploaded.
Audio Normalizer
Normalize audio volume in your browser: lift a too-quiet recording to a clean target level with peak or RMS normalisation, compare the before/after waveform, then download WAV or MP3. Nothing is uploaded.
Audio Recorder
Record from your microphone right in the browser: live level meter and timer, trim the ends on a waveform, then export a clean WAV or MP3. Nothing is uploaded. Your audio never leaves your device.
FLAC Converter
Convert audio to FLAC, the free lossless codec, right in your browser. Turn WAV, MP3, M4A, AAC or OGG into a bit-perfect, smaller-than-WAV FLAC archive with a waveform preview and exact size readout. Nothing is uploaded.
M4A Converter
Convert any audio to M4A (AAC) in your browser, WAV, MP3, OGG, FLAC and more into a clean, Apple-friendly.m4a that plays perfectly on iPhone, iPad, Mac and iTunes. Preview the waveform, choose AAC or M4A output, then download. Nothing is uploaded.
Comparisons & guides
Go deeper on the concepts behind the aac converter.
Common problems, solved
Hit a snag? Here are quick fixes for the issues people run into most.
My file wouldn't load or decode.
The converter can only handle audio your browser can decode. Most WAV, MP3, M4A, OGG and (on most browsers) FLAC files work. A DRM-protected purchase, a raw/exotic codec or a corrupt file may not. Try re-exporting the source to WAV first, then convert that to AAC.
The first conversion took a moment to start.
The AAC encoder is an on-demand codec that downloads once per session before the first conversion. That one-time load is normal. After it's cached, later AAC conversions in the same tab begin right away. The download runs locally and nothing about your file is uploaded.
The AAC sounds slightly worse than the original.
AAC is lossy, so some detail is discarded to shrink the file, and re-encoding an already-compressed source (like MP3) compounds it a touch. For the cleanest result, convert from a lossless WAV or FLAC rather than another compressed file.
The tab got slow or ran out of memory on a very long file.
Conversion holds the decoded audio in memory, so a multi-hour recording on a low-memory device can strain the tab. Close other heavy tabs and try again. For the longest files, trim the audio first (see the Audio Trimmer) or convert in shorter sections.
Get the most out of it
Convert from a lossless source (WAV or FLAC) whenever possible, re-encoding an existing MP3 or M4A only adds a little more loss, it can't restore quality.
AAC is the better small-file choice for anything headed to Apple devices, YouTube or a video editor. It beats a same-size MP3 on sound quality.
The codec loads once per session on your first conversion. After that, subsequent AAC conversions in the same tab start right away.
Check the before/after size readout, if the AAC still doesn't fit your target, the source is probably just long, so trim it (see the Audio Trimmer) rather than degrading the whole file.
Keep your original lossless file as the archive master. Treat the AAC as a delivery copy so you can always re-encode later at different settings.
What's new
Recent updates and improvements to the aac converter.
Initial release, in-browser AAC conversion from WAV, MP3, M4A, OGG, FLAC and WEBM via native Web Audio decoding plus an on-demand codec, with a source waveform preview, an exact before/after size readout and one-click download.
Added a clearer one-time codec-loading state so the page stays light until you convert, plus drag-and-drop and reset so you can encode another file without reloading.
Keep exploring
Problems we solve
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Your privacy is built in
Your audio is decoded and re-encoded entirely in your browser: the Web Audio API decodes it and an on-demand codec (the shared ffmpeg core) encodes the AAC locally on your device. Nothing is ever uploaded to a server, stored or logged, so you can safely convert interviews, rough mixes and unreleased tracks. There's no upload step and no cloud copy. Close the tab and every byte is gone.
- Runs in your browser
- No uploads
- Nothing stored
Ready to try the aac converter?
Free, private and instant. AAC Converter runs right in your browser.