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PDF to JPG Converter

Professional document rasterization tool. Convert PDF to high-resolution JPGs locally. Features batch selection, custom DPI (up to 1200), watermark stamping, and ISO/ANSI standard reference.

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About

Standard web-based converters introduce a critical security gap: they require uploading confidential documents to a remote server for processing. This architectural flaw exposes sensitive data (legal contracts, medical records, financial audits) to interception, retention policies, or server-side breaches. This utility operates on a Zero-Trust, Zero-Upload architecture. The conversion logic leverages WebAssembly to execute the rasterization pipeline entirely within the local browser memory stack.

Beyond security, this tool solves the "Blurry Text" problem common in free tools. Most converters default to 72 DPI (screen resolution). This engine allows granular control over sampling density, supporting up to 1200 DPI for archival preservation or prepress workflows. It incorporates a linear transformation matrix to map vector PDF coordinates to raster pixel grids without aliasing artifacts.

pdf jpg rasterizer client-side security batch-converter image-processing

Formulas

The process of converting a vector-based PDF page into a raster image (JPG) involves calculating the target pixel matrix based on the desired Dot Density D (DPI). For a page with physical dimensions Win and Hin:

Px = Win × D

The total uncompressed memory footprint M (in bytes) required for the raw bitmap buffer (RGBA) is:

M = Px × Py × 4 bytes/pixel

When compressing to JPG, the Discrete Cosine Transform (DCT) is applied. The final file size Sjpg is an approximation function of the Quality Factor q (0.0 to 1.0) and the image complexity entropy E:

Sjpg ≈ M × q15 × E

Reference Data

StandardSize NameDimensions (mm)@ 72 DPI (Screen)@ 300 DPI (Print)@ 600 DPI (Archival)
ISO 216 (A)A0841 × 11892384 × 33709933 × 1404319866 × 28087
ISO 216 (A)A1594 × 8411684 × 23847016 × 993314031 × 19866
ISO 216 (A)A2420 × 5941191 × 16844961 × 70169921 × 14031
ISO 216 (A)A3297 × 420842 × 11913508 × 49617016 × 9921
ISO 216 (A)A4210 × 297595 × 8422480 × 35084961 × 7016
ANSI (US)Letter215.9 × 279.4612 × 7922550 × 33005100 × 6600
ANSI (US)Legal215.9 × 355.6612 × 10082550 × 42005100 × 8400
ANSI (US)Tabloid (B)279.4 × 431.8792 × 12243300 × 51006600 × 10200
ANSI (US)Arch C457 × 6101296 × 17285400 × 720010800 × 14400
ANSI (US)Arch D610 × 9141728 × 25927200 × 1080014400 × 21600
ANSI (US)Arch E914 × 12192592 × 345610800 × 1440021600 × 28800
Video1080pN/A1920 × 1080N/AN/A
Video4K UHDN/A3840 × 2160N/AN/A

Frequently Asked Questions

High-DPI rasterization creates massive raw bitmaps in RAM before compression. A single A0 architectural plan at 600 DPI generates a raw bitmap exceeding 2 GB. Browsers limit per-tab memory; exceeding this causes the operation to fail or the tab to crash. We recommend processing fewer pages at a time for large formats.
Once the PDF is converted to JPG, the watermark is "baked" into the pixel data (rasterized). It cannot be removed by simply deleting a layer, as it becomes part of the image itself. This differs from PDF watermarks which are often separate vector objects.
Screen (72-96 DPI) is optimized for monitors and quick loading; it lacks the pixel density for physical media. Print (300 DPI) packs more than 9x the pixel data per square inch, ensuring crisp text and sharp lines when transferred to paper.
Browsers rely on the HTML5 Canvas API, which operates exclusively in the RGB color space. While the PDF parser can read CMYK data, the output JPG will always be converted to sRGB. This is sufficient for general use but may result in slight color shifts for professional offset printing.
Absolutely not. The "Upload" button is a technical misnomer; it simply grants the browser permission to read the file from your hard drive into its temporary memory sandbox. The data never leaves your device.