Media
Audio Join Stereo
Join two mono tracks into a single stereo file
file· File resultOpen tool
Quick start
Call this tool from your code in three languages.
cURL
# 1) Request a presigned URL → returns { uploadUrl, storageKey }
curl -X POST 'https://api.elysiatools.com/api/upload/presign/audio-join-stereo' \
-H 'Content-Type: application/json' \
-d '{"filename":"leftChannel.ext","contentType":"application/octet-stream","size":12345}'
curl -X POST 'https://api.elysiatools.com/api/upload/presign/audio-join-stereo' \
-H 'Content-Type: application/json' \
-d '{"filename":"rightChannel.ext","contentType":"application/octet-stream","size":12345}'
# 2) PUT the file bytes directly to the presigned uploadUrl
curl -X PUT '<presigned uploadUrl>' \
--data-binary @/path/to/file.ext
# 3) Call the tool, passing the returned storageKey for each file field
curl -X POST 'https://api.elysiatools.com/en/api/tools/audio-join-stereo' \
-F 'leftChannel=uploads/2026/01/01/your-tool-1700000000000-abc123.ext' \
-F 'rightChannel=uploads/2026/01/01/your-tool-1700000000000-abc123.ext'