Merge tools
3 tools tagged with “Merge”
Audio Joiner
Audio Joiner combines multiple audio files into a single continuous track with a simple upload → order → join workflow. Add two or more audio files, arrange them in the exact order you want using quick move controls, and click Join files to generate a downloadable MP3. The backend uses FFmpeg to concatenate audio reliably across common formats, then re-encodes the result into a consistent output that works well across devices and editors. The tool reports total input size, output size, percent size change, and the final joined duration so you can quickly confirm the merge completed as expected. A Sample input button loads a real multi-file example (intro, main, outro) to demonstrate the join behavior instantly. For planning and organization, an optional AI Assistant can suggest a joined title and clear labels for each segment based on filenames and durations, and it only runs when you explicitly trigger it.
File Conversion · Audio Converters
Audio Merger
Audio Merger mixes multiple audio files together into a single track, which is ideal when you need to overlay voice on background music, combine music layers, or blend sound effects into a bed. Upload two or more files, adjust each track’s volume using simple sliders, and click Merge audio to get one downloadable MP3. Unlike a join tool that plays files one after another, the merger overlays tracks at the same time and outputs a combined mix that follows the longest track duration. The backend uses FFmpeg’s mixing filters to apply per-track gain and combine streams into one consistent MP3 output. The tool also probes track durations so you can quickly see how long each file is and what the longest layer will be. For faster setup, an optional AI Assistant can suggest starting volume levels for common scenarios such as voice-over-music, layered music, or an effects bed, while keeping AI processing fully on the backend and only running when you request it.
File Conversion · Audio Converters
Merge PDF
Combine multiple PDF documents into a single unified file. Free online PDF merger supporting drag-and-drop reordering, different page sizes, and bookmark preservation. No signup required.
Document Processing · PDF Operations