Increase PDF Quality for Free | Best PDF Quality Enhancers in 2025

Every business professional knows the value of high-quality PDFs, either for printing reports, presenting slides, or handling scanned files. This is because a high-resolution PDF ensures that every detail, from the smallest font to the most complex images, is easily readable. Alternatively, when you compare a poor-quality PDF, its blurry text forces readers to strain their eyes, and the pixelated image ruins the presentation.

This kind of inconvenience is something almost everyone has faced, highlighting the need to increase PDF quality in the end. To get sorted, explore the article below and discover top-ranked PDF quality enhancers available in 2025.

Part 1. Common Reasons Why PDFs Lose Quality

To know how the PDF quality enhancer saves your day, first understand the common possibilities why these PDFs lose their quality:

• Over-Compression: PDF makers automatically apply compression to reduce file size, which can be helpful for sharing or storage. Whereas excessive compression can make images pixelated, text may become blurry, and fine details can disappear.
• Low-Resolution Scans: Although scanned documents are common among professionals, if the scanner settings are set to low resolution, the resulting PDF will reflect this. Legal documents and academic papers often suffer from this, making information difficult to read and invalidating the purpose of scanning.
• Inappropriate Export Settings: When you export files from Word or design software to PDF, choosing the wrong settings can immensely reduce the quality. Ultimately, your PDF text might appear fuzzy, graphics may lose sharpness, and complex layouts can become distorted.
• Multiple Conversions Simultaneously: Every time a document is converted from one format to another, either from PowerPoint to PDF, it loses some quality. Repeated conversions can compound this problem, resulting in a final PDF that is noticeably lower in quality than the source.
• Software is Obsolete or Incompatible: An old PDF viewer or incompatible software can even harm the appearance of a file. Such programs may not render fonts correctly, mishandle photos, or misalign layouts, lowering the overall readability.

Part 2. Top 8 PDF Quality Enhancer Tools in 2025

With the market filled with PDF enhancers, the listed programs are top-ranked to increase clarity of PDF for online and offline use. For a quick decision over which tool fits your need to increase PDF quality, explore the provided tabular comparison:

PDF Quality Enhancer 1. PDFelement

Best For: It's well-suited for business professionals who need to optimize contracts, signing, and collaboration for corporate workflows.

PDFelement is counted as a versatile PDF solution that automates reading, summarizing, and rewriting text for faster review. To enhance quality, you can modify text, images, and layouts, adjusting fonts, colors, and other elements.

Besides this, its AI OCR technology extracts editable text from scanned PDFs and images in your desired language. For further improvement, you can insert comments and add sticky notes, facilitating reviews and group edits.

PDF Quality Enhancer 2. Enhancepdf.com

Best For: Convenient for organizations needing consistent results at any volume, with guaranteed privacy and data protection.

This PDF quality enhancer online works by detecting image content within a PDF and applying AI enhancement, such as upscaling. Apart from this, it sharpens details and enhances vividness in PDFs without affecting the text or layout.

Here, automated processing works without manual intervention, simplifying the handling of multiple PDFs for bulk tasks. The platform even improves the color and clarity of all images within PDFs, perfect for print workflows.

PDF Quality Enhancer 3. DocHub

Best For: This platform is best for anyone who needs simple and fast document enhancement without technical expertise.

The AI PDF Enhancer in DocHub facilitates users to improve their scanned PDFs, messy tables, and low-quality images in files. This quality enhancer PDF automatically compresses and corrects images in PDFs to enhance clarity and convertibility for better handling.

Its ChatGPT-powered assistance enables advanced prompt-based workflows for quality improvements and summarization. The platform further fine-tunes scanned copies or poorly converted files, making them easier to work with.

PDF Quality Enhancer 4. pdfFiller

Best For: Anyone needing an all-in-one online solution for editing, enhancing, or sharing PDFs without any technicalities.

To increase PDF quality online for free, you can refer to pdfFiller, which simplifies the entire document lifecycle. It modifies text, rearranges pages, and adds annotations or custom fillable fields with ease within your documents.

Plus, you’re allowed to enhance the clarity of images and scanned content inside PDFs for better readability and print quality. Users can even track document-related workflow time for productivity insight to improve work habits.

PDF Quality Enhancer 5. Online2PDF

Best For: Ideal for anyone requiring accessible, quick, and free PDF conversion or basic enhancement features.

Online2PDF is a free, web-based PDF handler that allows users to upload files in multiple formats, such as XPS, besides PDF. To improve PDF quality online, it offers a range of tools, including add, reorder, define page ranges, and layout options.

On this platform, your uploaded files are not stored; all data is deleted after post-enhancing for users' security. After making improvements, you can reduce file sizes for sharing and storage purposes.

PDF Quality Enhancer 6. i2PDF

Best For: The platform is ideal for individuals who require the cleaning of scanned notes and contracts while maintaining quality.

Another free online PDF quality enhancer that enables one to improve the clarity and readability of scanned documents by fixing smudges. The platform automatically improves blurry and low-quality scans for better display, printing, and readability.

Apart from this, other additional features include compression, color adjustment, and grayscale conversion. You can even convert scanned images into PDFs into editable, searchable text for better enhancement later.

PDF Quality Enhancer 7. Smallpdf

Best For: This tool is ideal for beginners due to its minimal learning curve and drag-and-drop upload option.

Smallpdf is a leading online platform that facilitates users with an extensive set of over 30 tools for maintaining PDF quality. To increase the clarity of a PDF, it allows users to add text, images, and highlight content with pre-installed tools for improved readability.

After improving visuality, you can combine multiple PDFs or separate large files into smaller sections as per your convenience.

PDF Quality Enhancer 8. PDF Tool

Best For: Individuals seeking to enhance their PDFs to meet the requirements for uploading documents to various platforms.

A core feature of this tool is its unique upsizing, which is well known to increase the quality of PDFs. It further provides an option to compress files after increasing their sizes, for bi-directional adjustments. The platform guarantees maintaining the original quality and layout of PDFs while upscaling their file sizes.

Here, the entire process of uploading, inputting the desired size, processing, and downloading takes only a few seconds.

Part 3. How to Fix Corrupted PDFs Before Enhancing Quality

When trying to increase PDF quality, the process won’t succeed if the file itself is corrupted. A damaged PDF might fail to open, show blank pages, or display unreadable content. In such cases, enhancing resolution or sharpness won’t make any difference, you first need to repair the file.

That’s where Repairit PDF Repair comes in. This professional tool is designed specifically to restore corrupted or unreadable PDF files, ensuring they are fully accessible before you enhance their quality. Whether your PDF was damaged due to failed downloads, interrupted transfers, or software crashes, Repairit can recover it quickly and efficiently.

The best part? You can repair multiple PDFs at once, saving time while ensuring your documents remain intact and ready for optimization. Once the repair is complete, you can preview your restored PDF before saving it, guaranteeing that your data is safe and accurate.

Key Features

• Preview Repaired PDFs: Once you’re done with the process of repairing, it allows you to preview files before saving.
• Batch Repair: Repair multiple corrupted PDFs simultaneously for maximum efficiency.
• Full Compatibility: Works with all versions of PDF files, no matter the source or creation tool.

By repairing your files first, you can confidently move on to methods that truly increase PDF quality, such as enhancing resolution, improving readability, or optimizing file size without the risk of data loss.

Step 1. Commence the program, open the “More Types Repair” tab, and press the “Start” button under the Document Repair module.

Step 2. Move forward, press the “Add” button, and insert all the corrupted PDFs into the program for instant repair.

Step 3. Once all the PDFs are inserted, click the “Repair” button to initiate the process and save the repaired files later.

Part 4. Pro Tips to Increase PDF Quality Effectively

The benefit of a PDF quality enhancer online multiplies when combined with the following innovative practices:

1. Always Scan at High DPI: Try to aim for at least 300 DPI because higher DPI guarantees sharper text and images, reducing pixelation.
2. No Excessive Compression: Strike a balance between compressing lightly or using smart compression tools that maintain image clarity and text readability.
3. Export With Optimal Settings: When exporting files from Word or other software, select high-quality options to prevent unnecessary image down-sampling.
4. Examine Your Files Before Sharing: Always make sure to preview your PDFs after enhancement to check image resolution and formatting on both screen and paper.
5. Use Vector Graphics Instead of Raster: For charts and diagrams in PDFs, use vector graphics rather than raster images because they stay sharp at any size.

Conclusion

In summary, where digital documents in every profession demand professionalism, the quality of your PDFs should never be overlooked. Now, in 2025, the task to increase PDF quality is much simpler through numerous PDF enhancers in the market. Remember, quality enhancement works best on stable files, which is why Repairit is necessary when your PDFs are corrupted at their core.