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Test scope & comparison notes
These are recorded facts, not a unified ranking. Tested tiers and scope are not consistently recorded. Read pricing with its date and timing with its conditions. Privacy observations reflect visible flows and statements, not a security audit.
Cross-task capability coverage across selected products
Each product is scored independently per task edge; switch tasks below while keeping shared products selected| Task edge | aconvert.com | pdfcompressor.com | Switch / compare |
|---|---|---|---|
| Image compression | 86/100 2048 × 2048 · PNG | Not tested in topic | Compare in task topic → |
| PDF to Word | 79/100 DOCX · Output attached | Not tested in topic | Compare in task topic → |
| PDF compression | 96/100 PDF · Output attached | 79/100 PDF · Output attached | Active task |
| Video compression | 85/100 MP4 · Output attached | Not tested in topic | Compare in task topic → |
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Browse this task →| Criterion | Aconvert PDF compression 96/100 Seven-aspect task score Aconvert achieved a remarkable 93.96% size reduction on the 1.66MB benchmark PDF down to 100.2 KB (16.56x compression ratio) without requiring an account, preserving 100% of all 32 vector text operator groups and table layouts; with a 4.54s server turnaround and zero watermarks, it stands as an outstandingly honest and effective free PDF compressor. Tested export PDF · Output attached Historical test · 2026-11-05 | PDF Compressor PDF compression 79/100 Seven-aspect task score PDF Compressor provides a completely free, login-free batch compression service supporting up to 20 files with 1-hour auto-purge, slashing file size by 90.82% in 2.08s, but at the steep cost of rasterizing most vector text into bitmaps, sacrificing text selectability and sharp rendering. Tested export PDF · Output attached Historical test · 2026-10-31 |
|---|---|---|
| Pricing & rules | ||
| Pricing plans | Aconvert 100% free file conversion and compression service · 2026-11-01 Plan · source date Monthly / one-time Annual bill / period Quota & limits Free2026-11-01 ↗ Free Free Free 100% free without login, 40MB per file, up to 10 files per batch Full access to multi-format conversion and compression across documents, media, eBooks, and archives；40MB per-file limit, 10 files per batch, display ads present；Permanently free, no renewal；Perpetual access 1 plan / billing-period records, all listed; — means that period is not recorded. All conversion and compression features are 100% free with ad and voluntary donation support; 40MB per-file limit (up to 10 files per batch) with zero paid plans or paywalls. Cancellation, sources & verification recordCancellation and refund terms unverified Aconvert Official Homepage ↗ · 2026-11-01 Capture 1 ↗ Aconvert About and Free Model ↗ · 2026-11-01 Capture 1 ↗ | PDF Compressor web batch compression tool · 2026-10-31 Plan · source date Monthly / one-time Annual bill / period Quota & limits Web Free2026-10-31 ↗ Free Free Free Batch upload up to 20 files per task, unlimited daily usage Automated PDF compression with individual or batch ZIP downloads；1-hour file retention, maximum 20 files per batch 1 plan / billing-period records, all listed; — means that period is not recorded. Official site explicitly states all features are free, supporting up to 20 files at once with zero paywalls. Cancellation, sources & verification recordCompletely free without subscription; no cancellation or refund terms needed. Official homepage and compression workspace ↗ · 2026-10-31 Capture 1 ↗ |
| Free & trial allowance on the test date | Entirely free with 40MB per-file limit and up to 10 files per batch | Completely free, batch upload up to 20 files per task |
| Cancellation & refunds | Not verified | Completely free without subscription; no cancellation or refund terms needed. |
| Disclosure of costs & limits | Direct result table with download and delete actions after conversion | Homepage states 20-file batch limit; terms specify 1-hour deletion |
| Task quality | ||
| Measured fixture results | File reduction: 93.96% · Output size: 100.2 KB · Selectable text retained: 100% · Page 2 preserved: Yes | File reduction: 90.82% · Output size: 152.3 KB · Selectable text retained: 11.1% · Page 2 preserved: Yes |
| Fixture findings | 93.96% reduction (1,659 KB → 100.2 KB, 16.56x ratio), 100% vector text retention, 4.54s server processing, free guest export without watermarks. | In the 2-page mixed-content anchor benchmark, file size plummeted from 1,659 KB to 152.3 KB (-90.82%), but underlying vector text retention dropped to 11.1% (only 1 of 4 headings preserved, table text fully rasterized). |
| Original historical observation | Aconvert compressed the 1.66MB test PDF down to 100.2 KB under default 60 image quality while preserving 100% vector text and layout integrity (02_result.png, 03_download.png). | PDF Compressor accepted the sample without login, compressed it by 90.82% to 152.3 KB in 2.08s, and exported a watermark-free PDF with rasterized text (01_landing.png, 02_result.png, 03_download.png). |
| Suitable uses · historical assessment | Users needing massive PDF size reduction with razor-sharp vector text and zero account or subscription barriers | Users needing maximum file size reduction who do not require searchable or selectable vector text |
| Result & output evidence | ||
| Delivery capabilities | ||
| Recorded export specifications | PDF · Output attached · No watermark in test | PDF · Output attached · No watermark in test |
| Historical specification note · not an official maximum | Full 2-page native vector PDF (100.2 KB, 93.96% reduction) | Two-page PDF (152.3 KB, no watermark, 90.82% reduction) |
| Watermark observation | No watermark | No watermark |
| Batch & API | Supports up to 10 files per batch; 40MB per-file limit | Supports batch upload of up to 20 files with ZIP download |
| Recorded free-tier dimensions | Not verified | Not verified |
| Attached file dimensions | Not verified | Not verified |
| Speed & reliability | ||
| Timing observation | Network-observed server wait: 4.54s · End-to-end reference: 6.04s | Network-observed server wait: 2.08s · End-to-end reference: 2.08s |
| Date & fixture | 2026-11-05 · anchor_pdfcompress_v1 · US-West (California) | 2026-10-31 · anchor_pdfcompress_v1 · US-West (California, AS2914) |
| Repeated tests & reliability | No standardized repetition count, success rate or variability range is recorded. | No standardized repetition count, success rate or variability range is recorded. |
| Interaction experience | ||
| Account requirements | No login in this test | No login in this test |
| Sign-in methods | 100% guest access without account | Direct batch upload with zero login required |
| Manual adjustment | Not verified | Not verified |
| Interaction observations | Not verified | Not verified |
| Background & reputation | ||
| Service lifecycle notice | Not verified | Not verified |
| Operator | Aconvert Project (PDFConvertOnline.com) | PDF Compressor Team |
| Recorded origin | United States | Not verified |
| Domain history record | Development team active since 2000; Aconvert extended operations | Not verified |
| Background & reputation assessment | Not verified | Not verified |
| External reputation record | Long-running conversion service with over 530 million files converted, transparent server infrastructure disclosure, and multi-language support. | Not verified |
| Engineering & privacy | ||
| Processing location | Uploaded for cloud processing | Uploaded for cloud processing |
| Third-party tracking record | Google AdSense · Google Analytics | Google Ads · Google Analytics |
| Engineering & privacy assessment | Not verified | Not verified |
| Retention statement | Claims deletion within 2 hours; deletion not independently verified | Claims deletion within 1 hours; deletion not independently verified |
| Evaluation basis | ||
| Pricing transparency | ||
| Interaction restraint | ||
| Background & reputation | ||
| Engineering & privacy | ||
| Task quality | 65 / 65 Size Reduction: -93.96% (1659 KB → 100.2 KB, 16.56× ratio) · Selectable Vector Text Retained: 100% · Page 2 Preserved: Yes | 45 / 65 Size Reduction: -90.82% (1659 KB → 152.3 KB, 10.89× ratio) · Selectable Vector Text Retained: 11.1% · Page 2 Preserved: Yes |
| Deliverable specifications | 20 / 20 Clean unwatermarked export (8/8); Export spec: Full 2-page native vector PDF (100.2 KB, 93.96% reduction) | 14 / 20 Clean unwatermarked export (8/8); Export spec: Two-page PDF (152.3 KB, no watermark, 90.82% reduction) |
| Processing speed | 13 / 15 Network-observed server wait: 4.54s (API mode: cloud_aconvert_compress; network upload 1.5s / end-to-end 6.04s shown for reference only, never penalized) | 15 / 15 Network-observed server wait: 2.08s (API mode: cloud_pdfcompressor_cluster; network upload 0s / end-to-end 2.08s shown for reference only, never penalized) |
