Instafill.ai
7 days free
AI form filling · 33 fields · 1 page · done in seconds

Yes! You can use AI to fill out Form FL-335, Proof of Service by Mail

Don't type 33 fields by hand. Tell our AI about yourself, or upload a document you already have, and it fills every field in seconds. You check it, then download, print or sign.

7 days free, then $19.99/month · Cancel anytime
AI fills it, no typingEncrypted, never used to train AICancel in two clicks
Form FL-335, Proof of Service by Mail, page 1
Basic · 34/100Form Complexity Index

The AI does the filling. You just check it.

No typing into boxes, nothing to install.

Tell the AI about youAnswer a few questions in plain words, or upload a document you already have. That is all the typing there is.
AI fills every field in secondsIt puts each answer in the right box on every page, checkboxes included.
Check it and downloadReview every field, change anything, then download, print or sign the PDF.

What this form asks for

The AI fills all of it, from your answers or your documents.

Form FL-335, Proof of Service by Mail, is a legal document used in California courts to provide official proof that case documents were delivered to a party by mail. It is completed by a person over 18 who is not a party to the case, and it details what was served, to whom, where, and when. This form is critical for demonstrating compliance with legal service requirements, ensuring the case can proceed. Today, this form can be filled out quickly and accurately using AI-powered services like Instafill.ai, which can also convert non-fillable PDF versions into interactive fillable forms.
Fillable fields33
Pages1
Form Complexity IndexBasic, 34/100

The AI checks your answers before you download

13 checks built for this form, so a wrong date or a missing answer is caught before anyone else sees it.

Server is Not a Party to the Action

This check verifies that the name of the person completing the form (the server) does not match any of the names listed as Petitioner/Plaintiff, Respondent/Defendant, or Other Parent/Party. California law requires the server to be a neutral, non-party to the case who is at least 18 years old. If the server is a party, the service is invalid, which could lead to case delays or dismissal of the action being served.

Mailing Date and Signature Date Consistency

This validation ensures that the signature date (item 6) is on or after the date the documents were mailed (item 4c). A person cannot legally declare under penalty of perjury that they have mailed documents before the mailing has actually occurred. A signature date preceding the mailing date would invalidate the proof of service and require correction.

Required List of Served Documents

This check confirms that the field specifying the documents served (item 3) is not empty. It is legally insufficient to serve documents without explicitly listing what was served. Failure to provide this list makes the proof of service defective, as the court and the receiving party have no record of what was communicated.

Exclusive Mailing Method Selection

This validation ensures that exactly one of the two mailing methods (item 3a or 3b) is selected. The server must declare a specific method of mailing, either by direct deposit with USPS or through an ordinary business practice for mail collection. Selecting none or both options creates ambiguity and can invalidate the service declaration.

Server's Address Completeness

This check verifies that the server's residence or business address (item 2) is fully provided. This information is required by law to establish the server's eligibility and the location where the mailing took place. An incomplete address prevents verification of the server's status and can render the proof of service invalid.

Mailing Date Format and Validity

This validation confirms that the 'Date mailed' (item 4c) is present and formatted as a valid calendar date, such as MM/DD/YYYY. The date of mailing is a critical fact for calculating legal deadlines for responses. An invalid or missing date makes it impossible to determine if service was timely and properly executed.

And 7 more checks
  • Case Number Presence
  • Signature Date Presence and Format
  • Printed Name of Server Requirement
  • Recipient Information Completeness
  • Court County Specification
  • Party Identification Completeness
  • Hearing Date Validity

Let AI fill out your FL-335

No typing. Every field filled in seconds, checked, ready to sign.

7 days free, then $19.99/month · Cancel anytime

How to Fill Out FL-335 Online for Free in 2026

What the AI walks you through.

  1. Navigate to Instafill.ai and upload or select Form FL-335.
  2. Provide the case information, including the court name, case number, and the names of the petitioner/plaintiff and respondent/defendant.
  3. Enter the server's information in Section 1 and 2, confirming they are over 18, not a party to the case, and providing their address.
  4. In Section 3, list all the documents that were served by mail and select the method of mailing.
  5. Complete Section 4 with the full name and address of the person served, along with the date and city/state of mailing.
  6. If applicable, check the box in Section 5 for service of a request to modify a judgment or permanent order.
  7. The server must date and sign the form under penalty of perjury, then review the entire document for accuracy before downloading or e-filing.

Common Mistakes in Completing FL-335

The ones the AI is built to catch.

Server Is a Party to the Action
This occurs when the Petitioner, Respondent, or another named party in the case fills out and signs this form. Item 1 explicitly requires the server to be someone who is 'not a party to this action.' This mistake immediately invalidates the proof of service, as the law requires a neutral third party to handle service. To avoid this, always have a friend, family member, or professional process server over 18 who is not involved in the case perform the mailing and sign the form.
Using Mail Service for Restricted Documents
A critical error is using this form to serve documents that legally require personal service, such as a Summons or a Temporary Restraining Order. The form itself includes a notice: 'To serve temporary restraining orders you must use personal service (see form FL-330).' This mistake happens from misunderstanding legal procedure and results in invalid service, potentially delaying urgent court orders. Always verify the required service method for each document you are filing.
Vague or Incomplete List of Served Documents
In item 3, filers often write a generic description like 'court documents' or 'legal papers' instead of listing the exact title and form number of every single document included in the mailing. This ambiguity can lead to legal challenges where the opposing party claims they did not receive a specific document. To prevent this, list each document by its full name, such as 'Request for Order (FL-300)' and 'Income and Expense Declaration (FL-150)', to create a clear and indisputable record.
Missing or Incorrect Case Number
Forgetting to enter the case number or entering it incorrectly in the header is a frequent data entry error. The case number is the court's primary method for linking the document to the correct legal file. An incorrect or missing number can cause the proof of service to be rejected, misfiled, or lost, leading to significant delays and the appearance that service was never completed.
Forgetting to Sign or Date the Declaration
The server neglects to sign and/or date the form in item 6. An unsigned declaration is legally invalid because the server has not attested under penalty of perjury that the service was performed as described. This is a simple oversight that will cause the court clerk to reject the filing, forcing you to have the server sign and re-file the document, delaying your case.
Inconsistent or Illogical Dates
This mistake involves entering a signature date (item 6) that is earlier than the date of mailing (item 4c). A person cannot legally swear that they mailed something on a future date. This logical inconsistency will invalidate the form. The signature date must be the same day as or any day after the date of mailing. Using a form-filling tool like Instafill.ai can help flag such inconsistencies.
Incomplete or Incorrect Address for Person Served
Typos or omissions in the address of the person being served (item 4b) are common and can be fatal to the service. An incorrect street name, city, or ZIP code can be used as a basis to claim the documents were never received. It is crucial to double-check the address for accuracy against a known, valid address for the party or their attorney of record. AI-powered tools can help validate address formats to reduce errors.
Leaving the Server's Address Blank
Filers sometimes forget to complete item 2, which requires the server's residence or business address. This information is mandatory as it helps verify that the server is a real person who meets the legal requirements for serving documents (e.g., being a resident of the county where mailing occurred). Leaving this field blank can lead to the court deeming the proof of service defective.
Illegible Handwriting
When a form is filled out by hand, poor handwriting can make names, addresses, and dates unreadable to the court clerk and judge. This can lead to filing errors or rejection of the document. To ensure clarity, it is best to type the information. If the form is a flat, non-fillable PDF, a service like Instafill.ai can convert it into a fillable version, eliminating legibility issues.
Reversing Petitioner and Respondent Names
In the case caption at the top, people often mix up the 'PETITIONER/PLAINTIFF' and 'RESPONDENT/DEFENDANT' fields. This creates confusion and can cause problems with court records, especially in complex cases. To avoid this, carefully copy the party information exactly as it appears on the initial petition or other official court documents. Using an AI form-filler like Instafill.ai can ensure this information is populated consistently across all case forms.

Frequently Asked Questions About FL-335

 

Is it really free for 7 days?
Yes. You pay $0 today. Cancel before Nov 4 and you are never charged. Keep it, and it is $19.99 a month for 5 fills of your FL-335.
Can I fill other forms too?
This plan is for your FL-335: your own AI agent fills it as often as 5 times a month. To fill other forms and upload your own, choose a Professional plan from your account.
How do I cancel?
From your account, in two clicks, any time. No email, no call.
How does the AI fill out FL-335?
You answer a few questions in plain words, or upload a document you already have. The AI reads what you give it and puts each answer into the right field of FL-335, on every page, in seconds. It checks the answers against the form's own rules, and you review and change anything before you download, print or sign.
What happens to my information?
It is encrypted in transit and at rest, and it is never used to train AI.
How complex is FL-335 to fill out?
FL-335 has a Form Complexity Index of 34 out of 100, in the basic tier: 33 fillable fields across 1 page. Instafill.ai's AI fills it in under a minute, with every field there for you to review before you download.
What is the purpose of Form FL-335, Proof of Service by Mail?
Form FL-335 is a legal document used in California courts to prove that copies of case documents were sent to another party via mail. It serves as official evidence for the court that the other party has been notified.
Who is supposed to fill out and sign this form?
This form must be completed and signed by a person who is at least 18 years old and is not a party in the case (e.g., not the petitioner or respondent). This neutral third person is known as the 'server'.
Can I, as the petitioner or respondent, mail the documents and sign this form myself?
No, you cannot. The law requires a neutral person who is over 18 to be the one who mails the documents and signs the Proof of Service form to ensure impartiality.
What information do I need to list in section 3, 'I served a copy of the following documents'?
In section 3, you must list the exact, full titles of every legal document and attachment that the server enclosed in the envelope for mailing. Be specific to create a clear record of what was served.
Can I use this form to serve a temporary restraining order?
No. The form explicitly states that temporary restraining orders require personal service, and you should use Form FL-330 (Proof of Personal Service) for that purpose.
What is the difference between the two mailing options listed under item 3?
Option 'a' is for when the server personally drops the sealed envelope at a U.S. Post Office. Option 'b' is for when the envelope is placed in an office's outgoing mail system, to be collected and mailed as part of ordinary business practice.
When should I check the box in section 5?
Check the box in section 5 only if the documents being served are a request to modify a final judgment or permanent order for child custody, visitation, or child support. This often involves serving an address verification form (FL-334) as well.
What do I do with Form FL-335 after it has been completed and signed?
After the server signs the form, the original must be filed with the court clerk to become part of the official case record. You should also keep a copy for your own files.
What happens if I make a mistake on the Proof of Service form?
An incorrect or improperly signed Proof of Service can be deemed invalid by the court, which can cause significant delays in your case. It is crucial to ensure all information is accurate before filing.
Where does the server write their address on the form?
The server must write their own residence or business address in the space provided in section 2 of the form.
Can AI tools help me fill out Form FL-335?
Yes, services like Instafill.ai use AI to accurately auto-fill form fields with your case and party information, which saves time and helps reduce errors. The server would still need to verify the information and physically sign the form.
How can I fill out this form online using Instafill.ai?
You can upload the FL-335 form to Instafill.ai, and its AI will automatically populate the case information. After you review the auto-filled data, the server can complete the remaining sections before you print it for signing and filing.
The PDF version of Form FL-335 I found online is not fillable. What can I do?
If you have a non-fillable or 'flat' PDF, you can upload it to a service like Instafill.ai. The platform can convert it into an interactive, fillable form that you can easily complete online.
Encrypted in transit and at restNever used to train AIDelete your forms any time

Get your FL-335 filled out by AI

$0 today. Cancel before Nov 4 and you pay nothing.

Other forms like this one

California court forms: Judicial Council of California Form SC-105, Request for Court Order and Answer (Small Claims), Judicial Council of California Form SC-120, Defendant’s Claim and ORDER to Go to Small Claims Court (Small Claims), Judicial Council of California Form SER-001, Request for Sheriff to Serve Court Papers, Judicial Council of California Form SER-001, Request for Sheriff to Serve Court Papers, Affidavit for Collection of Personal Property California Probate Code Section 13100, Form POS-040, Proof of Service—Civil, Declaration of Facts of Death (California Superior Court), declaration-of-marriage-for-court-proceeding-california-family-law, ADOPT-200, Adoption Request, ADOPT-200, Stepparent Adoption Request, ADOPT-210, Adoption Agreement, ADOPT-310, Contact After Adoption Agreement, Judicial Council of California Form ADOPT-200, Adoption Request, Form ADR-107, Mediation Attendance Sheet, Form ADR-110, Order Appointing Referee, Form ADR-109, Stipulation or Motion for Order Appointing Referee, Form ADR-102, Request for Trial De Novo After Judicial Arbitration, Form ADR-108, Referee's Report (Code Civ. Proc., §§ 638, 639), Form ADR-106, Petition to Confirm, Correct, or Vacate Contractual Arbitration Award, Form ADR-104, Rejection of Award and Request for Trial After Attorney-Client Fee Arbitration

family law forms: Form 12.902(b), Family Law Financial Affidavit (Short Form), Florida Supreme Court Approved Family Law Form 12.901(b)(3), Petition for Dissolution of Marriage with No Dependent or Minor Child(ren) or Property (02/18), Form FL-170, Declaration for Default or Uncontested Dissolution or Legal Separation (Family Law), Form FL-100, Petition—Marriage/Domestic Partnership (Family Law), declaration-of-marriage-for-court-proceeding-california-family-law, Florida Supreme Court Approved Family Law Form 12.902(d), Uniform Child Custody Jurisdiction and Enforcement Act (UCCJEA) Affidavit, Florida Family Law Rules of Procedure Form 12.910(a), Summons: Personal Service on an Individual, Florida Supreme Court Approved Family Law Form 12.941(a), Petition for Enforcement of Out-of-State Custody Decree and for Order to Pick Up Minor Child(ren), Florida Supreme Court Approved Family Law Form 12.970(a), Petition for Temporary Custody by Extended Family, Form FL-110, Summons (Family Law), Form FL-120, Response—Marriage/Domestic Partnership (Family Law), ADOPT-200, Adoption Request, ADOPT-200, Stepparent Adoption Request, ADOPT-210, Adoption Agreement, ADOPT-310, Contact After Adoption Agreement, Adoption Assistance Program Nonrecurring Adoption Expense Agreement and Claim, Adoption Request (Stepparent), Adoption and Safe Families Act (ASFA) Survey, Florida Family Law Rules of Procedure Form 12.900(b), Notice of and Consent to Limited Appearance, Florida Family Law Rules of Procedure Form 12.900(d), Termination of Limited Appearance

family court forms: Form 12.995(c), Safety-Focused Parenting Plan, Florida Supreme Court Approved Family Law Form 12.901(b)(3), Petition for Dissolution of Marriage with No Dependent or Minor Child(ren) or Property (02/18), Form N161, Appellant’s notice (All appeals except small claims track appeals and appeals to the Family Division of the High Court), Form N161, Appellant's Notice (All appeals except small claims track appeals and appeals to the Family Division of the High Court), declaration-of-marriage-for-court-proceeding-california-family-law, Florida Supreme Court Approved Family Law Form 12.902(d), Uniform Child Custody Jurisdiction and Enforcement Act (UCCJEA) Affidavit, Florida Supreme Court Approved Family Law Form 12.941(a), Petition for Enforcement of Out-of-State Custody Decree and for Order to Pick Up Minor Child(ren), Florida Supreme Court Approved Family Law Form 12.970(a), Petition for Temporary Custody by Extended Family, Adoption Request (Stepparent), Florida Family Law Rules of Procedure Form 12.900(b), Notice of and Consent to Limited Appearance, Florida Family Law Rules of Procedure Form 12.900(d), Termination of Limited Appearance, Florida Family Law Rules of Procedure Form 12.900(e), Acknowledgment of Assistance by Attorney, Florida Family Law Rules of Procedure Form 12.900(g), Agreement Limiting Representation, Florida Family Law Rules of Procedure Form 12.900(h), Notice of Related Cases, Florida Family Law Rules of Procedure Form 12.901(a), Joint Petition for Simplified Dissolution of Marriage, Form 12.902(b), Family Law Financial Affidavit (Short Form), Florida Family Law Rules of Procedure Form 12.902(c), Family Law Financial Affidavit (Long Form), Florida Family Law Rules of Procedure Form 12.902(e), Child Support Guidelines Worksheet, Florida Supreme Court Approved Family Law Form 12.902(f)(1), Marital Settlement Agreement for Dissolution of Marriage with Dependent or Minor Child(ren), Florida Supreme Court Approved Family Law Form 12.902(f)(2), Marital Settlement Agreement for Dissolution of Marriage with Property but No Dependent or Minor Child(ren)

proof of service forms: Form POS-040, Proof of Service—Civil, Judicial Council of California Form SC-104, Proof of Service (Small Claims), Judicial Council of California Form SC-104, Proof of Service (Small Claims), Form DV-200, Proof of Personal Service (CLETS) (Domestic Violence Prevention), Illinois Circuit Court Eviction Summons and Proof of Service of Eviction Summons & Eviction Complaint (Form E-S 3507.3), proof-of-electronic-service-appellate, Form APP-009, Proof of Service (Appellate Division), Form APP-109, Proof of Service (Appellate Division), Form GC-020(P), PROOF OF PERSONAL SERVICE OF NOTICE OF HEARING— GUARDIANSHIP OR CONSERVATORSHIP, Form APP-109E, Proof of Electronic Service (Appellate Division), Proof of Personal Service of Notice of Initial Appearance—CARE Act Proceedings, Form CARE-116, Proof of Personal Service of Notice of Hearing—CARE Act Proceedings, Form CR-106, Proof of Service — Criminal Record Clearing, CARE-107, Proof of Personal Service of Notice of Order for CARE Act Report, Form CIV-120, Notice of Entry of Dismissal and Proof of Service, Form DAL-012, Proof of Service—Disability Access Litigation, Form DE-120(P), Proof of Personal Service of Notice of Hearing—Decedent's Estate or Trust, Form EA-200, Proof of Personal Service (Elder or Dependent Adult Abuse Prevention), Form EA-260, Proof of Service of Order After Hearing by Mail (Elder or Dependent Adult Abuse Prevention), Form FL-115, Proof of Service of Summons (Family Law—Uniform Parentage—Custody and Support)

7 days free, then $19.99/month · Cancel anytime