Last updated on
Dec 29, 2025
Edit your PDF and compress it directly within the editor. Choose from high, medium, or low compression levels to balance quality and file size according to your needs.
Reduce 21 mb PDF File to 15 mb with pdfFiller
How to reduce 21 mb PDF file to 15 mb
To reduce a 21 mb PDF file to 15 mb, utilize pdfFiller’s PDF compression tool. Simply upload your PDF, select the desired compression level, and download the newly compressed file within minutes.
What is a PDF?
PDF, or Portable Document Format, is a file format developed by Adobe that captures document text, fonts, images, and even layout of any source document. It ensures that your files are displayed correctly on any device. The size of PDF files can vary greatly depending on the content and images included.
Why is reducing 21 mb PDF file to 15 mb essential for document management?
Reducing the size of your PDF files is crucial for efficient document management, especially when sharing files via email or uploading to cloud services. Large files can hinder collaboration, exceed email limits, and slow down data transfer speeds.
What are the key features of pdfFiller for reducing PDF size?
pdfFiller offers a range of powerful features to help users effectively compress their PDF files. These features include customizable compression levels, batch processing, and a cloud-based platform for accessibility.
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Customizable compression levels for optimal file size.
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Batch processing capability for handling multiple files at once.
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Cloud-based access enabling file management from any location.
Which file formats does pdfFiller support?
pdfFiller primarily focuses on PDF files, but it also supports various other file formats for conversion. This flexibility allows users to work with different document types effortlessly.
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PDF
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DOCX
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JPG
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TXT
What compression levels and customization options does pdfFiller offer?
pdfFiller allows users to choose from multiple compression settings to balance between file size and quality. Users can select options such as high, medium, or low compression, depending on their specific needs.
How can batch processing reduce multiple PDF files at once?
With pdfFiller's batch processing feature, users can compress multiple PDF files simultaneously. This is particularly useful for businesses or teams that handle large volumes of documents regularly.
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Select multiple files for batch upload.
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Choose desired compression level.
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Initiate compression and wait for completion.
How to use pdfFiller to reduce 21 mb PDF to 15 mb: step-by-step guide
Follow these step-by-step instructions to use pdfFiller to reduce your PDF file size:
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Go to pdfFiller and log in or create an account.
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Upload your 21 mb PDF file.
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Select 'Compress PDF' from the menu options.
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Choose the desired compression level.
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Click 'Compress' to start the process.
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Download your newly compressed 15 mb PDF file.
What are the benefits of reducing PDF size via pdfFiller?
There are numerous advantages to using pdfFiller for PDF compression, including enhanced efficiency in file sharing, better storage management, and improved performance when accessing documents online.
What industries can benefit from reducing PDF files?
Various industries benefit from PDF size reduction, particularly those that rely heavily on document sharing, such as education, legal, finance, and healthcare.
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Education - Sharing course materials and assignments.
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Legal - Filing documents without exceeding size limits.
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Finance - Distributing reports and financial statements.
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Healthcare - Managing patient records in digital form.
How does pdfFiller compare with alternatives for PDF compression?
While there are various tools available for PDF compression, pdfFiller stands out with its intuitive interface, advanced features, and comprehensive cloud-based solutions, making it suitable for both individuals and teams.
What is the conclusion for reducing PDF file size with pdfFiller?
In summary, to reduce a 21 mb PDF file to 15 mb, pdfFiller offers a comprehensive solution that combines ease of use with powerful functionality. By utilizing its advanced features and capabilities, users can effectively manage and share documents more efficiently.
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Compress and edit PDFs in one place
Equip yourself with powerful PDF tools
Edit PDFs online almost as easily as Word documents. Add text, adjust formatting, replace content, insert images, and more. pdfFiller has all you need to get your documents done from start to finish.
eSign and send documents
Sign documents on your own or send them to others for signatures, whether a single recipient or an entire group. You can assign roles, manage the signing order, set reminders, and request additional authentication.
Annotate and collaborate
Highlight important data, redact sensitive details, add sticky notes, and exchange comments in your PDFs. Then, instantly send documents for review or editing. You can also share files and folders with your team to boost collaboration.
Organize and manage PDFs
Merge, split, rearrange, and convert PDFs into formats like DOCX, XLSX, JPEG, PNG, and PPTX. Secure your documents by locking them with a password or placing them in an encrypted folder.
Secure files in the cloud
Organize your documents and templates in secure cloud storage and access them from anywhere. pdfFiller follows strict security regulations such as GDPR, HIPAA, PCI DSS, SOC 2 Type II, and others to help safeguard your data.
How to compress your PDF?
1. Upload your document
Upload a document from your device, cloud storage, email, or URL.
2. Open a document in the editor
Edit your document and click the Compress button in the top menu panel.
3. Set compression parameters
Select the file format, destination, and compression level, then hit Save.
Who needs this?
Explore how professionals across industries use pdfFiller to compress PDFs
Education
Teachers and administrators can reduce file sizes for effortless sharing with pdfFiller’s compress feature, and enhance collaboration between students and educators with pdfFiller's tools designed for seamless collaboration.
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Lesson plans
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Student enrollment forms
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Class schedules
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Permission slips
Real Estate
Real estate agents and brokers compress PDFs to quickly share documents with clients and colleagues via email attachments or a link. They also use pdfFiller to customize templates, ensuring everything is consistent and error-free.
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Property listing brochures
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Lease agreements
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Sales contracts
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Property management forms
Healthcare
Healthcare professionals use pdfFiller to create, fill out, and compress PDFs for secure document sharing and faster uploads to patient portals. Sending forms via links or embedding them on websites simplifies data collection and improves the patient experience.
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Patient intake forms
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Appointment schedules
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Prescription forms
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Consent forms
Finance
Financial analysts and accountants use pdfFiller to create, customize, and share financial documents. With the PDF compress feature, finance professionals can quickly convert documents in the right format, share and conveniently store them in the cloud.
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Financial statements
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Tax forms
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Invoices
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Expense reports
Sales
Sales teams use pdfFiller’s compress feature to easily share proposals and contracts with clients. Sharing documents via link or email helps speed up communication, close deals faster, and boost productivity.
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Sales proposals
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Quotation forms
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Order forms
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Customer feedback surveys
Insurance
Insurance agents use pdfFiller to edit and compress documents like policy files, claims forms, and client onboarding materials for easy sharing and secure storage. With pdfFiller, they can share insurance documents via link or email to get them signed in seconds.
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Insurance policy documents
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Claim forms
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Risk assessment reports
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Client onboarding documents
Why compress documents with pdfFiller?
Optimize quality at the right file size
pdfFiller offers three compression settings and shows the estimated file size. Need a smaller file? Simply bump up the compression level.
Convert & compress in one go
Convert your PDFs to Word, Excel, PPT, JPEG, or PNG and compress them in one step. This lets you get documents in the right format and size without juggling multiple tools.
Export & share with ease
Download your compressed file, send it directly to cloud storage, or share it with others in seconds. With pdfFiller, you don't have to manually move files whenever you need to compress or convert a document.
pdfFiller scores top ratings on review platforms
I'm just beginning and not sure I'm using it correctly. what I'd like to do is to be able to simply use the icon in my internet task bar to open the account rather than have to open up pdffiller.com
It made a nice document. The only thing that is challenging is that you have to go line by line instead of having an option to change more than one line.
A great Program
Its a good program, but it takes a few minutes to get use to the actual text placement for your fill in. I did not try the signature feature. I will continue to use this program. I'll use it more often as I get use to it.
PdfFiller - Sign
I adopted this tool from the first day
I can sign all documents without print them and scan them...
More expensive.It was better : new pricing plan : pay to sign for one document
I am more than satisfied with the…
I am more than satisfied with the functions of this application. As a student I find this platform to be very useful. I plan on keeping my subscription
What do you like best?
Ability to quickly and easily edit PDF's
What do you dislike?
Sometimes it's difficult to undo changes made.
What problems are you solving with the product? What benefits have you realized?
I work in real estate and I often need to fill in PDF's with information for my clients. Being able to do in a web based platform makes it easy to do on any computer.
Watch our PDF compress in action
Check out a quick video tutorial that shows how to compress any file into an editable PDF in three easy steps.
What businesses achieve with pdfFiller
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How to reduce PDF to 10 MB?
How to compress PDF files Go to the Compress PDF tool. Upload the documents you want to compress by clicking the button or dragging and dropping your file. Choose between the Extreme, Recommended or Less compression level. Hit the Compress PDF button. Download your optimized PDF or save it back to the cloud.
How to compress a PDF from 20MB to 5MB?
How To Compress PDF to 5MB Step 1: Upload Your PDF to PI7 PDF Compressor. To get started, go to the PI7 PDF Compressor website and click the "Choose File" button to upload your PDF. Step 2: Select Your Compression Level. Step 3: Compress Your PDF to 5MB. Step 4: Download and Save Your Compressed PDF.