Conversion Speed Benchmark, July 2026
All 20 conversions completed successfully on the production API; 17 finished in under 10 s server-side, the slower cases being webm-to-mp4 at 239 s, mp4-to-webm at 38 s, mp4-to-gif at 23 s.
We ran 20 representative conversions through the live POST /v1/convert/base64 endpoint and recorded input size, output size, wall time, server processing time, and whether each output was structurally valid. The full dataset is available to download .
Methodology
API under test: convertintomp4.com production API - POST https://api.convertintomp4.com/v1/convert/base64.
Wall time: t0 = immediately after POST returns (upload time excluded); t1 = first poll cycle showing status=completed. Granularity is 3s poll interval, so wallSeconds is quantized at 3s steps. Use processingMs (result.duration from status response) for precise server-side timing.
Inputs: each case used one representative file per format, a single 30-second 1080p clip for video formats, a 60-second WAV/MP3 for audio, a 2000×1500 image, and a synthesized 10-page PDF or DOCX for documents. File details are listed in the downloadable dataset.
- Single run, not averaged - timing reflects one execution on the live production server under real concurrent load; it is not a controlled laboratory benchmark.
- One file size per case - results scale with resolution, duration, and bitrate; the numbers here are indicative, not universal.
- No competitor lanes - this study measures only our own API; no third-party services were tested.
- Poll-quantized wall time - wall seconds are quantized at 3 s poll intervals; use
processingMsin the dataset for precise server-side timing. - pdf-to-jpg returns a ZIP - multi-page PDFs produce one JPEG per page packed into a ZIP archive, so the output size reflects all 10 pages.
Video conversions
| Case | Input | Output | Wall time | Server time | Valid |
|---|---|---|---|---|---|
| MP4 → MP3 | 23.66 MB | 143 KB | 6.3 s | 4.7 s | |
| MP4 → MOV | 23.66 MB | 23.66 MB | 9.4 s | 4.1 s | |
| MP4 → WEBM | 23.66 MB | 27.81 MB | 40.5 s | 37.9 s | |
| MOV → MP4 | 22.05 MB | 22.05 MB | 6.3 s | 4.0 s | |
| MKV → MP4 | 22.03 MB | 22.05 MB | 9.4 s | 4.5 s | |
| WEBM → MP4 | 7.60 MB | 30.84 MB | 244.7 s | 4.0 min | |
| MP4 → GIF | 23.66 MB | 64.14 MB | 31.2 s | 23.2 s |
Audio conversions
| Case | Input | Output | Wall time | Server time | Valid |
|---|---|---|---|---|---|
| WAV → MP3 | 10.58 MB | 383 KB | 6.3 s | 4.1 s | |
| MP3 → WAV | 2.40 MB | 10.58 MB | 6.3 s | 3.6 s | |
| WAV → FLAC | 10.58 MB | 743 KB | 6.3 s | 4.6 s |
Image conversions
| Case | Input | Output | Wall time | Server time | Valid |
|---|---|---|---|---|---|
| PNG → WEBP | 212 KB | 33 KB | 6.3 s | 3.7 s | |
| PNG → JPG | 212 KB | 50 KB | 6.3 s | 3.6 s | |
| JPG → PNG | 105 KB | 218 KB | 6.3 s | 3.7 s | |
| WEBP → PNG | 28 KB | 242 KB | 6.3 s | 3.7 s | |
| JPG → PDF | 105 KB | 171 KB | 6.3 s | 3.7 s | |
| PNG → PDF | 212 KB | 212 KB | 6.3 s | 3.6 s |
Document conversions
| Case | Input | Output | Wall time | Server time | Valid |
|---|---|---|---|---|---|
| PDF → JPG Multi-page PDF: API returned ZIP archive with 10 .jpg files. Automated JPEG magic check flagged this as failed (magic 504b0304=PK); reclassified after unzipping and verifying first page. | 80 KB | 5.54 MB | 6.3 s | 4.4 s | |
| PDF → DOCX | 80 KB | 40 KB | 6.3 s | 4.9 s | |
| DOCX → PDF | 6 KB | 23 KB | 6.3 s | 5.0 s | |
| PDF → TXT | 80 KB | 23 KB | 6.3 s | 3.5 s |
Reproduce this study
Every case in this study can be reproduced using the public API. Send a POST /v1/convert/base64 request with your file base64-encoded in the base64Data field alongside sourceFormat and targetFormat, then poll GET /v1/status/:jobId until status=completed. The result.duration field in the status response gives precise server-side processing time in milliseconds.
Full request/response schemas, field descriptions, and language SDK examples are in the API documentation. An API key is required for production use.
Download dataset (JSON, 8 KB)Conversion Speed & Quality Index
Editorial speed and output-size ratings for 91 popular conversions, derived from engine characteristics.
Video conversions
| Conversion | Speed | Output size change | |
|---|---|---|---|
| 3GP to MP4 | Fast | ~50% smaller | Convert |
| AVI to MP3 | Instant | ~97% smaller | Convert |
| AVI to MP4 | Fast | varies | Convert |
| FLV to MP4 | Fast | varies | Convert |
| GIF to JPG | Instant | varies | Convert |
| GIF to MP4 | Instant | ~62% smaller | Convert |
| GIF to PNG | Instant | ~98% smaller | Convert |
| GIF to WebP | Fast | ~18% smaller | Convert |
| M4V to MP4 | Instant | unchanged | Convert |
| MKV to AVI | Fast | grows | Convert |
| MKV to MP3 | Instant | ~94% smaller | Convert |
| MKV to MP4 | Instant | unchanged | Convert |
| MOV to AVI | Fast | grows | Convert |
| MOV to GIF | Fast | grows | Convert |
| MOV to MP3 | Instant | ~94% smaller | Convert |
| MOV to MP4 | Instant | unchanged | Convert |
| MP4 to AVI | Fast | varies | Convert |
| MP4 to GIF | Fast | grows | Convert |
| MP4 to MOV | Instant | unchanged | Convert |
| MP4 to MP3 | Instant | ~95% smaller | Convert |
| MP4 to WAV | Fast | grows | Convert |
| MP4 to WebM | Heavier | varies | Convert |
| MPEG to MP4 | Fast | varies | Convert |
| MTS to MP4 | Instant | unchanged | Convert |
| OGV to MP4 | Heavier | ~22% smaller | Convert |
| TS to MP4 | Instant | unchanged | Convert |
| VOB to MP4 | Fast | ~86% smaller | Convert |
| WebM to GIF | Instant | ~64% smaller | Convert |
| WebM to MP3 | Instant | ~80% smaller | Convert |
| WebM to MP4 | Fast | grows | Convert |
| WMV to MP4 | Fast | grows | Convert |
Audio conversions
| Conversion | Speed | Output size change | |
|---|---|---|---|
| AAC to MP3 | Instant | varies | Convert |
| AC3 to MP3 | Fast | unchanged | Convert |
| AMR to MP3 | Instant | ~37% smaller | Convert |
| FLAC to MP3 | Heavier | ~62% smaller | Convert |
| FLAC to WAV | Instant | grows | Convert |
| M4A to MP3 | Instant | varies | Convert |
| MP3 to MP4 | Heavier | ~30% smaller | Convert |
| MP3 to OGG | Fast | ~93% smaller | Convert |
| MP3 to WAV | Instant | grows | Convert |
| OGG to MP3 | Instant | grows | Convert |
| Opus to MP3 | Instant | grows | Convert |
| WAV to MP3 | Instant | varies | Convert |
| WMA to MP3 | Instant | varies | Convert |
Image conversions
| Conversion | Speed | Output size change | |
|---|---|---|---|
| AVIF to JPG | Instant | grows | Convert |
| AVIF to PNG | Heavier | grows | Convert |
| BMP to JPG | Instant | ~91% smaller | Convert |
| BMP to PNG | Instant | ~86% smaller | Convert |
| EPS to JPG | Fast | ~96% smaller | Convert |
| EPS to PNG | Heavier | ~79% smaller | Convert |
| HEIC to JPG | Instant | grows | Convert |
| HEIC to PNG | Heavier | grows | Convert |
| JPG to PDF | Instant | varies | Convert |
| JPG to PNG | Instant | grows | Convert |
| JPG to SVG | Instant | ~87% smaller | Convert |
| JPG to WebP | Instant | ~60% smaller | Convert |
| PNG to ICO | Instant | varies | Convert |
| PNG to JPG | Instant | ~65% smaller | Convert |
| PNG to PDF | Instant | ~42% smaller | Convert |
| PNG to SVG | Instant | ~99% smaller | Convert |
| PNG to WebP | Instant | ~93% smaller | Convert |
| PSD to JPG | Instant | ~98% smaller | Convert |
| PSD to PNG | Fast | ~60% smaller | Convert |
| SVG to JPG | Instant | grows | Convert |
| SVG to PNG | Instant | grows | Convert |
| TGA to PNG | Fast | ~64% smaller | Convert |
| TIFF to JPG | Instant | ~95% smaller | Convert |
| TIFF to PDF | Instant | ~41% smaller | Convert |
| TIFF to PNG | Fast | ~24% smaller | Convert |
| WebP to GIF | Fast | grows | Convert |
| WebP to JPG | Instant | grows | Convert |
| WebP to PDF | Instant | grows | Convert |
| WebP to PNG | Fast | grows | Convert |
spreadsheet conversions
| Conversion | Speed | Output size change | |
|---|---|---|---|
| CSV to XLSX | Instant | grows | Convert |
| XLSX to CSV | Instant | ~79% smaller | Convert |
| XLSX to PDF | Instant | grows | Convert |
Document conversions
| Conversion | Speed | Output size change | |
|---|---|---|---|
| DOC to DOCX | Fast | ~78% smaller | Convert |
| DOC to PDF | Instant | grows | Convert |
| DOCX to PDF | Instant | grows | Convert |
| HTML to PDF | Fast | grows | Convert |
| ODT to DOCX | Instant | ~16% smaller | Convert |
| ODT to PDF | Fast | grows | Convert |
| PDF to DOCX | Fast | ~77% smaller | Convert |
| PDF to JPG | Instant | grows | Convert |
| PDF to PNG | Instant | grows | Convert |
| PDF to PPTX | Instant | ~80% smaller | Convert |
| PDF to TXT | Instant | ~93% smaller | Convert |
| RTF to PDF | Instant | grows | Convert |
eBook conversions
| Conversion | Speed | Output size change | |
|---|---|---|---|
| EPUB to MOBI | Fast | grows | Convert |
| MOBI to EPUB | Fast | ~18% smaller | Convert |
presentation conversions
| Conversion | Speed | Output size change | |
|---|---|---|---|
| PPTX to PDF | Instant | unchanged | Convert |
How the editorial index above differs from the measured study
The per-pair index is editorial: ratings derived from engine characteristics and spot-runs on our production worker in June 2026, not from the single instrumented run documented at the top of this page. Speed is wall-clock time on a representative source file, a 10-second 1280×720 clip for video, a 3-minute track for audio, a 1920×1080 image, or a short document. Output-size change is the converted file versus the source. Figures are indicative: real timing and size depend on your file's length, resolution and source bitrate.
Looking for compression specifically? See our File Compression Benchmark 2026.