Includes current cVBRb Windows packages for creating MP3 files from WAV and other audio sources. lamemp3.co.uk is a focused branch project from Media Player Codec Pack, with practical build notes, branch notes and command-line examples.
Use the Windows builds below for command-line encoding, Exact Audio Copy integration, batch work and current cVBRb testing.
Use the Online MP3 Encoder for quick browser-based conversion without installing anything. Use the EAC Guide if you are ripping CDs. Use Command Examples if you want copy-and-paste LAME commands, and the MP3 Bitrate Guide if you are choosing between VBR, CBR, V0, V2, 192 kbps or 320 kbps.
For the technical behaviour behind strict minimum VBR and bitrate boost, see VBR, cVBR and cVBRb Compared.
The original LAME project built its reputation through encoder quality, speed, psychoacoustic tuning, VBR improvements and open collaboration. This site presents an independent build branch with its own release notes and Windows packages.
LAME began around mid-1998 as work around an earlier MP3 encoder, then grew through open-source collaboration into a respected encoder project.
The project moved beyond patch work and replaced the remaining reference source, becoming a complete LGPL MP3 encoder.
Development focused on psychoacoustics, noise shaping, VBR behaviour, presets, speed and practical listening quality.
This site is structured so each release can sit under its own version group, starting with the current LAME 3.101 beta 3 cVBR/cVBRb package set.
Browse packages by LAME version without mixing release numbers into every build title. This keeps Visual Studio SIMD and MinGW Solid State variants easier to compare as more package sets are published.
Choose Visual Studio SIMD builds when you want optimized CPU runtime paths, multi-threaded encoder work and bitrate-boost testing. The compact cards mark these as SSE2/AVX/Multi-thread. Choose MinGW Solid State builds for the simple compatibility-focused path with runtime DLLs included. Use the version filter above as the catalogue grows.
Performance-focused 64-bit Visual Studio SIMD build with cVBRb features, runtime SIMD path selection and OpenMP-assisted encoder work.
Enhancements: SSE2/AVX/Multi-thread
32-bit Visual Studio SIMD build for users who want the same SIMD mode structure as the x64 performance build on 32-bit Windows targets.
Enhancements: SSE2/AVX/Multi-thread
High-compatibility 64-bit MinGW Solid State build using the plain reference path instead of the newer MinGW SIMD performance line.
High-compatibility 32-bit MinGW Solid State build with the same simple path design as the x64 MinGW release.
The The Visual Studio packages are now the optimized SIMD cVBRb Windows builds for users who want to test newer performance paths, stricter bitrate-control options and bitrate-boost branch work.
Shared VS build features include ABR boost support at level 1, SSE2 / AVX2 / AVX-512 runtime CPU paths where supported, the q4-related VBR path patch, and OpenMP-assisted multi-threading for selected quantization/Huffman work.
In plain terms, OpenMP is used to let some heavier encoding work use more than one CPU thread. Individual packages may still differ by architecture, experimental feature set, executable name and command-line options. MinGW packages remain separate because they now serve as the Solid State compatibility line while Visual Studio carries the SIMD performance line.
These notes describe branch behaviour and user-facing options. The shared Visual Studio enhancements are grouped above so the individual package listings can focus on what differs between the Visual Studio SIMD builds and the MinGW Solid State compatibility builds.
The --vbr-min-strict option turns the bitrate supplied with -b into a hard floor. Unlike LAME -F, frames should not be encoded below the configured minimum.
The --vbr-max <bitrate> option can set a maximum allowed bitrate for cVBR mode, useful for streaming, device compatibility and controlled distribution targets.
The cVBRb branch adds --bitrate-boost[=n] for demanding audio changes. Levels 1, 2 and 3 map to light, medium and aggressive boost behaviour.
All featured packages include the q4-related patch from this fork. It is a bug fix for the affected VBR path, not a separate quality preset.
Standard LAME options remain supported. These examples highlight the additional options included in this fork. If you only need a quick browser-based conversion, use the Online MP3 Encoder. If you rip CDs with Exact Audio Copy, see the EAC LAME guide. For more examples, see the command-line examples.
lame -V0 -b 192 --vbr-min-strict --vbr-max 320 input.wav output.mp3Constrains VBR output between 192 kbps and 320 kbps.
lame -V0 -b 192 --vbr-min-strict --bitrate-boost=2 input.wav output.mp3Enables medium bitrate boost in the cVBRb branch.
lame --abr 192 --bitrate-boost input.wav output.mp3Bitrate boost also works in ABR mode, limited to level 1.
lame --decode input.mp3 output.wavThe encoder EXE is the primary command-line tool and can be used directly for normal encoding. Keep the included DLLs with the bundle when testing decode support or when a host application loads libmp3lame.dll. DLL compatibility depends on the application using it.
New users often expect an installer or a desktop app. These packages are command line encoder builds, so the EXE is normally run with input and output filenames rather than opened by double-clicking. Prefer not to use the command line? Try the Online MP3 Encoder.
Unzip one package, place a WAV file in the same folder, open PowerShell in that folder and run a command like this:
.\lame_cVBRb_x64.exe input.wav output.mp3Use the actual EXE name from your download. If the command succeeds, the new MP3 file appears in the same folder.
A command line encoder is a tool rather than a full music app. It is designed to be called with options, used in scripts, or used by other software that needs MP3 encoding.
lame.exe is a Windows command line encoder. It is a program you run from Command Prompt, PowerShell, a batch file or another audio application to convert supported audio input into an MP3 file.
These packages are portable encoder builds. There is no setup wizard. You unzip the package and run the encoder EXE directly from Command Prompt or PowerShell. The EXE is the main tool; the included DLL files are for bundled decode support and for applications that load libmp3lame.dll directly.
Open PowerShell or Command Prompt in the folder containing the EXE and run a command such as lame_cVBRb_x64.exe input.wav output.mp3. Replace the EXE name with the build you downloaded and replace the filenames with your own audio file names.
A WAV file is the easiest starting point. Put the WAV file in the same folder as the encoder, then use it as the input file in the command. MP3 output will be written to the filename you choose.
Usually no. If you double-click a command line encoder, a console window may appear and close quickly because no input or output file was supplied. Run it from PowerShell or Command Prompt so you can provide filenames and options.
Most users on modern Windows should start with an x64 build. Use an x86 build only for older 32-bit systems. Visual Studio SIMD builds are the optimized performance packages, while MinGW Solid State builds are the high-compatibility packages that include the required runtime DLLs.
cVBR is a constrained VBR branch that can keep variable bitrate encoding within a stricter range. cVBRb adds bitrate boost behaviour for more demanding audio changes. Standard LAME options still remain available.
For normal command-line encoding, the encoder EXE can be used directly. Keep the included DLL files with the bundle when testing decode support or when an application loads libmp3lame.dll directly. DLL compatibility depends on the host application, because some programs expect a specific libmp3lame name, export table, calling convention or ordinal layout.
Maybe, but it depends on the application. Some programs load libmp3lame.dll normally, while others require a matching DLL build or export ordinal layout. If a host application does not accept the DLL, use that application's recommended LAME package or use the included encoder EXE directly.
The VirusTotal link lets you view an external scan report for the ZIP file SHA-256. It is provided as a verification aid, not a guarantee. Always compare the SHA-256 on this page with the file you downloaded, and remember that new command-line tools or DLLs can sometimes produce false positives.
No. Checksums are provided as an advanced detail for users who want to manually verify a downloaded ZIP file. Most users can simply download the package that matches their Windows system and follow the usage example.
Use this section to compare included files, branch features and technical package information. The Visual Studio cVBRb optimized builds list their CPU runtime paths, multi-threaded encoder work and cVBRb options here; the compact download cards only show the short feature signal. Keep the MinGW DLLs beside the executable for decode support.
Use this when you want the fastest 64-bit build and your CPU supports the newer SIMD paths.
LAME_3.101b3_cVBRb_20260620_AVX_OpenMP_Bundle_x64.zip15adbf3a4104468dac00bc5e09585d74009a908e0f2d9ee2067c8b2776b5722bVirusTotal is an external verification aid. Compare the SHA-256 above with your downloaded ZIP. A clean report does not guarantee safety, and a detection can be a false positive.
Use this for 32-bit compatibility while keeping the same SIMD-capable feature line as the x64 Visual Studio build.
LAME_3.101b3_cVBRb_20260620_AVX_OpenMP_Bundle.zipe8d1932757bd397fa9b1bdda90c47436b4a04c53e50ee2cb042221d46f86e121VirusTotal is an external verification aid. Compare the SHA-256 above with your downloaded ZIP. A clean report does not guarantee safety, and a detection can be a false positive.
Use this when compatibility and a simple predictable encoder path matter more than peak SIMD performance.
LAME_3.101b3_cVBRb_20260620_Bundle_x64.zip25b80fd2dd792c5da3b6e1c9477d3de501de108c6037adbb623d1f8577bb7945VirusTotal is an external verification aid. Compare the SHA-256 above with your downloaded ZIP. A clean report does not guarantee safety, and a detection can be a false positive.
Use this for older 32-bit Windows compatibility and the simplest supported MinGW release path.
LAME_3.101b3_cVBRb_20260620_Bundle.zip3ef03fa3361884a61d997b708c0ef2da7945c771d57b195a4f10bdf882c86fcbVirusTotal is an external verification aid. Compare the SHA-256 above with your downloaded ZIP. A clean report does not guarantee safety, and a detection can be a false positive.
Most visitors are looking for the Windows encoder download or the browser encoder.